Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39a5d15ce5c62ef…

MALICIOUS

PDF

139.3 KB Created: 2021-06-12 00:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b72060152f9c8125ef65c086a29c5449 SHA-1: cf4972d06cdcaa78532d794b068186850bb5340e SHA-256: d39a5d15ce5c62ef4c6dfd40ce599464c3bd691d7f2289f41e66ca4ed671ab51
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to host malicious content. The presence of a 'download button' lure and instructions for a password-protected archive further suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/pbw?utm_term=movgamezone+gta+v5 PDF link annotation
    • https://besunuvoduzusub.weebly.com/uploads/1/3/4/2/134266379/4880585.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424029/normal_5fe9f30d3784a.pdfIn PDF document text
    • https://dafizoxov.weebly.com/uploads/1/3/5/3/135309439/3f97a.pdfIn PDF document text
    • https://mitiguranam.weebly.com/uploads/1/3/4/4/134456526/9674511.pdfIn PDF document text
    • https://toxisejaris.weebly.com/uploads/1/3/4/8/134851702/tezebapob.pdfIn PDF document text
    • https://fililajivivumir.weebly.com/uploads/1/3/4/4/134456316/339cde90d7482f.pdfIn PDF document text
    • https://sazofezobixana.weebly.com/uploads/1/3/4/5/134524546/7095855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_601223e1c039e.pdfIn PDF document text
    • https://tojalebume.weebly.com/uploads/1/3/4/6/134603773/vibunebidevonigimot.pdfIn PDF document text
    • https://tozubovudifudi.weebly.com/uploads/1/3/5/9/135973827/058706b256aa46.pdfIn PDF document text
    • https://fumuteserem.weebly.com/uploads/1/3/5/3/135333711/492020.pdfIn PDF document text
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/19724b9058331c9.pdfIn PDF document text
    • https://vesizolakaz.weebly.com/uploads/1/3/4/3/134333528/nozegejipa-pikuxufupa-mibuxunovisolu-bajupikoxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375887/normal_60072f0b7c223.pdfIn PDF document text
    • https://sonolinezib.weebly.com/uploads/1/3/0/8/130874018/ba2b7876db0100.pdfIn PDF document text
    • https://vojosapixetogal.weebly.com/uploads/1/3/4/7/134770394/dujipifo_sozija_pokaza_dawadof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2179dafa-5f36-4155-a780-9f21b9a28020/35490266076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c5ac536-09e4-412b-9ddc-5df74f1ef360/59580888683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02a90da9-89c0-417e-9ddf-e1958f10e19a/simotowupitifov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fe58b63-b02b-4cdd-9ea0-71e82848b377/xiligavifaxesagowavuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f09829a-8924-40be-a53a-858b962c1eae/60837835971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/471bd4a2-6f34-4bc7-9ccc-82993d3d0521/wugumuroruduvi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4C6 4864 bytes
SHA-256: 0a967a613cdd178e1481a8c4f9986e0b08010780e150921d0d8ab1103f5add5a
font_01_sfnt_off0001c5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5C3 4940 bytes
SHA-256: 0ca7818bbd3b0d72c52ee14ac98932ac9058402e6968ae839a19af15107dba63
font_02_sfnt_off0001d6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6A3 1852 bytes
SHA-256: ab7952e30a868751faa025f2e14b53a51e83c417853e71d0ae878d8a5e8faa15
font_03_sfnt_off0001df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF7C 12344 bytes
SHA-256: 55398c6d1082562d59adb69f938cc2340bc1f27fec29198104fddff4b62bd5f5
font_04_sfnt_off000208ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208AB 16344 bytes
SHA-256: 7e0863d6dcdfe3ce59f67395a06e5e8634226e44f713773c85e494ff6d119ee1