Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41e3e442c01321e…

MALICIOUS

PDF

93.9 KB Created: 2021-05-29 07:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e565c1026d4c5c63a5be991cb54a5ce7 SHA-1: 1a9aaa4e6f605016da7c36de25f1941bd71f45f3 SHA-256: e41e3e442c01321ee6d2f2eeaf89d210d8df004b3836cfea76331de6f79c49af
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded URLs suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/strik?utm_term=what+is+a+tumbled+stone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421039/normal_60118eae86abf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451556/normal_6056d91cc725c.pdfIn PDF document text
    • https://zepafasamog.weebly.com/uploads/1/3/4/3/134361306/c67a423d4eb2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496577/normal_604979d5698a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386848/normal_5fd1577c0f503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_606ea1fa1beaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446264/normal_605b7cdbdf7fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_6056e2e4dd711.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368742/normal_60068cb85b8c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466364/normal_606681233e4dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447276/normal_5fd63467b70a9.pdfIn PDF document text
    • https://kepoxenuranejes.weebly.com/uploads/1/3/4/3/134396716/tukijobugafi.pdfIn PDF document text
    • https://jedunaxalow.weebly.com/uploads/1/3/1/6/131606453/tubesar_biwiwixatafarik_pinarame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406464/normal_6028eff5b8fce.pdfIn PDF document text
    • https://sapixokevabose.weebly.com/uploads/1/3/4/4/134498139/xefobug-kemebuvageki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473044/normal_604b4c83d658d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506063/normal_5ff97a2ac0064.pdfIn PDF document text
    • https://jukamonasob.weebly.com/uploads/1/3/0/7/130740128/tupinawoxegezizeda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_6052aadd01abd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459467/normal_601c62ce3a304.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0ebe598b-b110-471d-af0a-8345c2fcacda/ruud_silhouette_ii_gas_furnace_pilot_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/415bbcab-f00a-4902-927f-b320635f0928/dadazomoresifogidufuwed.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAD 5004 bytes
SHA-256: 00f3d230f6ad78b1adc6d7372b96b4518a0a1cca07f18b9f3cb0ed77fc27aab5
font_01_sfnt_off0001208e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 11124 bytes
SHA-256: 29164c92a709297044f28fdf7c36a9ecdb11ef54036878da5c4e626bccbc7a09
font_02_sfnt_off000146af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AF 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8
font_03_sfnt_off00015bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC8 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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