Malicious PDF — malware analysis report

Static analysis result for SHA-256 3882540feb4090a8…

MALICIOUS

PDF

94.7 KB Created: 2020-12-09 21:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7c5da0bacbbfa312e74bbe70ecfe5d8d SHA-1: b3d5388bd4163dd78af1c994fc81ef030b974fde SHA-256: 3882540feb4090a8dbb0397d95c105005108cef6566916653cd42223a7076140
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with one heuristic specifically identifying it as a link farm, suggesting a phishing or SEO manipulation tactic. The presence of embedded URLs and the nature of the heuristics point towards a phishing attempt or a mechanism to distribute further malicious content, potentially via JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/aws?utm_term=free+amazing+ppt+templates PDF link annotation
    • https://vefubonipit.weebly.com/uploads/1/3/4/7/134719522/jomikeboset-suzomoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446645/normal_5fc1d7427f520.pdfIn PDF document text
    • https://vekeliludodim.weebly.com/uploads/1/3/4/7/134745250/razisilaj.pdfIn PDF document text
    • https://riwinuwozobama.weebly.com/uploads/1/3/4/8/134868589/8742869.pdfIn PDF document text
    • https://rugurujumififez.weebly.com/uploads/1/3/1/3/131384765/4179082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_5fb62d13802e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470836/normal_5fc6dcf907314.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486351/normal_5fcdb45838faf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f91250ce3fc9.pdfIn PDF document text
    • https://zifimegepero.weebly.com/uploads/1/3/4/6/134601706/8d8175bf3c.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/06f284ca-d7ad-4382-be79-c133abbd761a/contenidos_conceptuales_procedimentales_y_actitudinales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474f9b32-ffe1-4be4-9980-5b6b8c0d5c3b/85522240083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02dce7fd-0d44-4153-b5c9-1f31f3c5786b/26644058113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fbd741d-65ed-4de4-8676-b6a73a543c83/50019725766.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e99fa13a450babf41659/t/5fc22a2508845d0924d32dd7/1606560293949/85702785967.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2d38e5687f52b6b8dad8d/t/5fc9b9a581b71b408594947b/1607055783299/100_days_of_summer_safety.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c713f3f-4603-4f2e-90d9-ee6d402ab4d8/jodunon.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12988 4820 bytes
SHA-256: 640108882b7c9fb549caf7407c91f491ff5b4b58d7d2c2212a98f72127b3e4af
font_01_sfnt_off000139c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C7 11124 bytes
SHA-256: 7a65b63a3e8e9858a26544f8e68ed994a5e5d6c69c645811776d9b5cf6f57650
font_02_sfnt_off00015f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F41 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c