Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f8fda4fe921796…

MALICIOUS

PDF

70.8 KB Created: 2021-02-22 02:05:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: dccdfd474281f82854a4aac4a33a30b6 SHA-1: 85079c5791ae51337dfd198c1f14ffa71059d0d9 SHA-256: 75f8fda4fe9217966ec792419e7940016eff6955f72f932d0fb9dd345f9cb79a
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV specifically flagging it as 'Pdf.Phishing.Trojan'. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or scam pretext, likely to trick users into clicking the numerous links provided.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://bologen.ru/strik?utm_term=dol+definition+of+seasonal+employee PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366304/normal_5ff6624ad2946.pdfIn PDF document text
    • https://putojedenavaxo.weebly.com/uploads/1/3/2/6/132683165/61cb5ade9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375196/normal_601f0352eb87a.pdfIn PDF document text
    • https://dugefovi.weebly.com/uploads/1/3/1/4/131453799/1691794.pdfIn PDF document text
    • https://jukuzowak.weebly.com/uploads/1/3/1/3/131379830/05138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388842/normal_5fe95fd164bf5.pdfIn PDF document text
    • https://cdn.sqhk.co/tifobebe/ujcBZLW/islands_menu_prices.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/Djhigjc/raxamivupozafofotamefom.pdfIn PDF document text
    • https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/fukelozi.pdfIn PDF document text
    • https://zedusolurifi.weebly.com/uploads/1/3/3/9/133999882/litutiwizewodoxazaka.pdfIn PDF document text
    • https://sexojeno.weebly.com/uploads/1/3/3/9/133997780/7274dde0777d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388422/normal_600a44289e480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380209/normal_5fcc100872e35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426955/normal_5fd7894bd0d22.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/cXgfnJl/27880623220.pdfIn PDF document text
    • https://xeromikivato.weebly.com/uploads/1/3/2/6/132695960/5613807.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD811 5192 bytes
SHA-256: 7f39a9b4b4abed153f22f6583c169187810e074400e3eb1a6b05272ce4117a05
font_01_sfnt_off0000e9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C2 10716 bytes
SHA-256: 437025d4304fe013f4df169c6fc85bf08fe7c860441b961bf209827b2bcc1c0c

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