Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91d97f9e15e0041…

MALICIOUS

PDF

76.2 KB Created: 2020-11-16 16:35:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 427658e547917bcacc2c1b4d38822e19 SHA-1: dc66a18e4b125e00f01451e547da2ef8f7304f1e SHA-256: e91d97f9e15e0041a2d9945f9b05e81806e9ab10bde9b79f24c2551adb00cabf
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the presence of numerous external links, with one pointing to a suspicious URL on 'traffnew.ru'. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffnew.ru/aws?utm_term=happy+birthday+brother+images PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450240/normal_5fa5dda175579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413714/normal_5fad7b67c670f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480145/normal_5fad2c2faef51.pdfIn PDF document text
    • https://vagonegasix.weebly.com/uploads/1/3/1/4/131482995/9920973.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376878/normal_5fada8945d0ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_5fa867a9a9662.pdfIn PDF document text
    • https://tovegema.weebly.com/uploads/1/3/4/5/134505564/wekafasetesik-semerorajutanef-bewatoluxu.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/ba4a70a9-39ac-421e-bd4b-e6473c95a918/wasedaniviketabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34cf2a73-5ba5-40da-b493-15001dc08a75/wanovapakajiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad84fa6-7b2d-49b7-acee-d65191496c03/breadfruit_season_in_jamaica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a48aa9-d3a7-4427-9d55-6df4dae83aad/80372823580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dfe5ecd-9597-4def-829c-fa631b7c12e1/raves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b85114da-0579-42a4-a0de-17081cf1501e/shih_tzu_breeders_in_nj.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_off0000e008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE008 5224 bytes
SHA-256: 8cb533cd5b12ace387a20b67d9b498b138c0a285741990294991840b69d687c5
font_01_sfnt_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 10612 bytes
SHA-256: 14d7f95662c52f727f351fe7ded7be372c1f05a43a1f77a75563d15744add3f3
font_02_sfnt_off00011561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11561 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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