Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97c1769a763e63f…

MALICIOUS

PDF

68.9 KB Created: 2020-11-26 05:57:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56c176c2bd78ad872a9b40b3b7284549 SHA-1: 5967316840dd921fde3eadf6265e4415f03d6b7d SHA-256: e97c1769a763e63f3ced14ed819bd44c4a2ffdeef043d15ab289ffbbfed54b88
252 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm designed to redirect users to malicious sites. The presence of a known malicious redirector URL and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://traffmen.ru/123?utm_term=different+parts+of+a+church+building
    • https://duvupobilalef.weebly.com/uploads/1/3/4/6/134630448/a52c4328c3f69b6.pdf
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/tejogasujotagunof.pdf
    • https://dofukuligofevo.weebly.com/uploads/1/3/4/8/134869200/a51183ec3c3.pdf
    • https://rofuvawe.weebly.com/uploads/1/3/4/3/134363923/7278977.pdf
    • https://denofunafefu.weebly.com/uploads/1/3/4/7/134750316/gelugudinok.pdf
    • https://domuzowejiro.weebly.com/uploads/1/3/4/3/134360268/e5d800c5.pdf
    • https://lazekikobetilof.weebly.com/uploads/1/3/4/4/134443651/9314328.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8f92a52b-72a8-4cd3-9ca1-5db50740ab16/sepolumelekirejeg.pdf
    • https://uploads.strikinglycdn.com/files/f1a9b8bb-a468-49ae-aae4-d34ca0fdc133/44582199238.pdf
    • https://s3.amazonaws.com/wazorixekunafob/guidelines_management_of_liver_cirrhosis.pdf
    • https://uploads.strikinglycdn.com/files/39c51cec-f79a-47cf-8559-97949dd25e58/bmw_f650gs_service_manual.pdf
    • https://s3.amazonaws.com/napisakaluja/12602341863.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1fc.bin
c5620f354914447d56de766ac6eb9e8fcf40d39e62edacf17b3e03f6a3fb11a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FC 5556 bytes
font_01_sfnt_off0000e4db.bin
77354a785de3a0e4e34bee7a81be3b08d60df3876332386375ed236b5e52bd5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 10288 bytes

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