Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df04bed5c177553…

MALICIOUS

PDF

88.6 KB Created: 2021-05-31 07:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5a97fc703df27447f2c6b5a18b2a6096 SHA-1: cc75f7c39d80521a93269e7804954e1bfce730c3 SHA-256: 8df04bed5c17755346700df6197cc066747b93fdde853f0f6bd4f14c7df455cd
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/123?utm_term=achieve+ielts+listening+test+2+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501231/normal_6015ff3e6b36c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387933/normal_606d5194e4896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_6055c30143326.pdfIn PDF document text
    • https://kugavulaxux.weebly.com/uploads/1/3/4/4/134454690/399539.pdfIn PDF document text
    • https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/cbda1d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385230/normal_604e8ba9df450.pdfIn PDF document text
    • https://paxazojip.weebly.com/uploads/1/3/0/8/130873894/ragesobudin-figoxifukip.pdfIn PDF document text
    • https://josudumebumokix.weebly.com/uploads/1/3/4/0/134040650/vemiwire.pdfIn PDF document text
    • https://fozunisomizu.weebly.com/uploads/1/3/4/6/134666093/0111ab79f9cc51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381104/normal_60368da938751.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402940/normal_6001399890bfa.pdfIn PDF document text
    • https://rirudelibuwa.weebly.com/uploads/1/3/1/6/131606594/2904047.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/3772856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471682/normal_601b05937b8b9.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4368495/normal_60b005956fb36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403543/normal_603169509fe65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419194/normal_6017176d88b6b.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/48b4c7be-9fa3-479a-8495-122f5e3cf392/breville_juice_fountain_cold_plus_assembly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5cb8c69-2a71-483e-b908-886b06b554f9/6178904029.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_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 5012 bytes
SHA-256: 01cffc17467c499d74ca7ef341befadd24e09d0426ecf12b5c9c17f9fdb48ac3
font_01_sfnt_off0000f962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF962 24084 bytes
SHA-256: 1938e50d02577678cc38434bd2e4a58c41e0c2824ba35dbccba3615fcf88c896
font_02_sfnt_off00012fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD1 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953
font_03_sfnt_off0001446b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c