Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71fcead586fe357…

MALICIOUS

PDF

74.3 KB Created: 2020-12-22 23:01:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4aea9f7477760dd22954003d682e2039 SHA-1: 21a62a254b751e15d52f72132718805d5e97a6f5 SHA-256: d71fcead586fe357586e304487ef650d8cd68fa512fa083c0a7811f6d8c651e9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it is part of a link farm designed to drive traffic to external sites. One of the embedded URLs, 'https://trafficel.ru/123?utm_term=to+whom+it+may concern meaning in punjabi', appears to be a lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/123?utm_term=to+whom+it+may+concern+meaning+in+punjabi PDF link annotation
    • https://nitevafatuva.weebly.com/uploads/1/3/4/8/134872456/dixapatad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422658/normal_5f99e6568b3a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412909/normal_5f98da61dfb94.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/17849354825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e2fcd48-9a52-460c-930b-f2bf32068f0e/vexinelenopawefe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf49422dd96f5918e4b45d/1606371651829/bavinovuvirevubu.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/sniper_assassin_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73b66492-77e3-4ec5-b431-c0cde1336340/70977951389.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6c781c89b935f15ddc3c4/t/5fd70db0df2f0204c24dbf3e/1607929265004/brand_new_world_shiena_nishizawa.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/rumufopopebotigixojopeniv.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/93005805313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f2e0d33-0074-4911-abf5-32e64283aab3/houston_to_singapore_business_class.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3a23e7848ba205d29b2a8/t/5fd22fcdb1f6926771614960/1607610317858/45433002972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed9cdd49-6087-41fb-bde4-be4f467058fb/43922439582.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5A 5496 bytes
SHA-256: 557523cb4bb63e41ac9f841aead6f157c8e3b2ced5f343f0a7879014c5b9a214
font_01_sfnt_off0000cef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF7 4476 bytes
SHA-256: a418621cf896316e7dd464c7466f73cab5e5089af1ebab9460dd79d19e284a39
font_02_sfnt_off0000e020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE020 10528 bytes
SHA-256: 1f1d387354f146936d20719a279fc806d01f0ccf1a90de500dccffd81bbbf0a6
font_03_sfnt_off00010425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10425 6816 bytes
SHA-256: 04160dfe02c582f64190590f4523deb863283f8404c14ede20c14e6b4a32b8cf

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