Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc71812f32ce9b3…

MALICIOUS

PDF

85.0 KB Created: 2021-03-22 08:26:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 94a306147a6e8b97e5eeb3bc69ee4277 SHA-1: 2a8ea9f7364b19c7b03bf3fad698f58bd4f24e52 SHA-256: abc71812f32ce9b3e7e696ffab610b882a47dc889dc4c9ec4ccf2c0a6bcbc32b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs like 'https://maypoin.ru/wix?keyword=american+woodshop+sawhorse+plans' are likely part of this scheme to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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.
  • 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://maypoin.ru/wix?keyword=american+woodshop+sawhorse+plans PDF link annotation
    • https://cdn.sqhk.co/nobutowug/jaWjhUK/go_longhorns_meme.pdfIn PDF document text
    • https://pomixorum.weebly.com/uploads/1/3/1/6/131606605/dotamononit_sumeton_tetid_gurita.pdfIn PDF document text
    • https://vesizolakaz.weebly.com/uploads/1/3/4/3/134333528/8791905.pdfIn PDF document text
    • https://vinusipiwa.weebly.com/uploads/1/3/1/3/131381721/kemotizama.pdfIn PDF document text
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/ririjetemivubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466657/normal_601254d18cda1.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/ejerJuZ/dalefisatisezosupekelotif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478933/normal_60282d80ee0d2.pdfIn PDF document text
    • https://rujijixagav.weebly.com/uploads/1/3/1/3/131383475/denadeziraxija.pdfIn PDF document text
    • https://cdn.sqhk.co/berazanoga/hab0ApI/99418555626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459654/normal_60513510ce233.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/bXjhoJp/clix_build_websites_publish_for_free.pdfIn PDF document text
    • https://jadivamanug.weebly.com/uploads/1/3/4/8/134868371/3022329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_5fe7cc3e557ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459805/normal_5fdb7e5063c39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474450/normal_5fe62c5ad76b4.pdfIn PDF document text
    • https://kipigifusulip.weebly.com/uploads/1/3/4/4/134437712/katixaxipajujinolale.pdfIn PDF document text
    • https://xivovawa.weebly.com/uploads/1/3/4/8/134875493/ca0f15b1c2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_602e009438757.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/297f52d3-5e27-49f1-b1d3-527ab4167408/17886096320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b45d13fb-b765-4685-b435-53dca5b48ced/how_do_you_become_a_kid_spy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/241ebbc7-65f3-44a3-8e1c-dcdc01b7f97e/kojowotudabobukelevofujer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 5396 bytes
SHA-256: 292a0152dd707c99ac23ef2b5248b1166e145a95d5d8d7361262bc1b2a31af91
font_01_sfnt_off000107c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C4 12100 bytes
SHA-256: a46bf5b47e788dfde8eb3d46ae667d441bd2bc9a108696253028e32abf78804b
font_02_sfnt_off00013150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13150 16160 bytes
SHA-256: 9ffc405fbed68b1ed35cf25504b2a045b5802e2074cf99e6920a228075e829fc