Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f7c21248e8bedd…

MALICIOUS

PDF

78.7 KB Created: 2020-11-18 15:21:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1d3e114a714e90b53e2f72df3e820a97 SHA-1: bc123f72b18b504e47c657c996ee2c16c810d55a SHA-256: 78f7c21248e8beddf9f995e8e2ef2082fca1030016071015e038a71682313be5
342 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.001 Malicious Link T1071.001 Web Protocols

The PDF contains multiple heuristics indicating malicious intent, including redirection links, a link farm, and brand impersonation for credential phishing. The document body, though partially corrupted, references 'voting api services' and the presence of embedded URLs suggests a lure to external malicious content. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://depasosuva.weebly.com/uploads/1/3/4/4/134483816/dawonokena_liken_folipimetinetiv_sibava.pdf.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://gettraff.ru/strik?utm_term=voting+api+services In PDF document text
    • https://depasosuva.weebly.com/uploads/1/3/4/4/134483816/dawonokena_liken_folipimetinetiv_sibava.pdfIn PDF document text
    • https://gajegebukorivip.weebly.com/uploads/1/3/4/4/134487765/mekepafed-nasalesaziw-mevanibuw.pdfIn PDF document text
    • https://kiwusaxanasatip.weebly.com/uploads/1/3/0/7/130738973/14b68d92.pdfIn PDF document text
    • https://wilowepixamu.weebly.com/uploads/1/3/4/4/134476622/6592818.pdfIn PDF document text
    • https://zutafemaz.weebly.com/uploads/1/3/4/4/134478566/b1eed828fc3.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/c9c7233a-549a-418d-a38e-ec52d8f9fd06/nakizaniges.pdfIn PDF document text
    • https://s3.amazonaws.com/xatojem/tt_trung_thu_tt_on_vin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08eb74cf-dbdd-4979-9b7f-96c2372e63e9/lifepunolokibuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d152369c-04b1-483f-b53b-0b2d49b9061a/47821173142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5d06ba0-861a-4964-bba4-e07edb96a6df/dogafu.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/lusozuwolopumivekeganox.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/duvepipoxogod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195df103-573b-419c-824d-bd4c9ae1570b/zepojewijejutatefaxim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0548fc3-87e8-4c6f-bc0f-d16d098f3735/budozewetokoxufetosivafav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/995adc3d-ab35-4b25-9ff4-57ff1d91ba06/1822431730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd21359-70a9-4e00-a623-a027d89bbab9/96677766536.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_off0000ea6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 4880 bytes
SHA-256: 71bdb2ebe28c230da5e210ba103488f6be3495fef431eb4099af9dcdfc80e053
font_01_sfnt_off0000fb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB12 10840 bytes
SHA-256: 6d1a3738b6abe3f51e4db6a14aa92ac21c9bf2ea68f28adef85ec2252a08b419
font_02_sfnt_off00011fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDF 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2