Malicious PDF — malware analysis report

Static analysis result for SHA-256 43eb0977ec33c945…

MALICIOUS

PDF

65.7 KB Created: 2020-11-19 08:25:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65a3764308abd9201606c9e98ab9da99 SHA-1: 7c4a4b39707ad14fe51ad0cd0f576f6b4ddcf8ce SHA-256: 43eb0977ec33c94558dd9d519fb652ee541f81f86f98df02edccbc184e265da3
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on file-sharing or personal website platforms, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous unknown reputation URLs strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with attempts to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://trafftec.ru/123?utm_term=pine+lane+elementary+base
    • https://cdn-cms.f-static.net/uploads/4370762/normal_5fb43066ee24e.pdf
    • https://cdn-cms.f-static.net/uploads/4407724/normal_5f998341568eb.pdf
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/kofimidipi.pdf
    • https://cdn-cms.f-static.net/uploads/4413007/normal_5faabf6c09283.pdf
    • https://mizinunebij.weebly.com/uploads/1/3/4/6/134660950/3646777.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8925184.pdf
    • https://cdn-cms.f-static.net/uploads/4452199/normal_5fa260f6328aa.pdf
    • https://vetaguluxidi.weebly.com/uploads/1/3/4/6/134656260/wugefepibagisix-besiviro-rijopukibodubew-fotalufodebix.pdf
    • https://tadazumagitose.weebly.com/uploads/1/3/3/9/133987040/1183581.pdf
    • https:///realestate.realestateyak.com/i/Pine_Lane_Elementary_School_Homes_For_Sale,hiddenInputs:<input
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/86f09ee0-0dfa-4687-9a6b-01e68829c7da/33337616476.pdf
    • https://s3.amazonaws.com/fulosobezur/first_to_fight_usmc_book.pdf
    • https://uploads.strikinglycdn.com/files/b957fa16-0cb7-43e2-88c4-ba889946232f/bondo_fiberglass_resin_sds_sheet.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_off0000c4c6.bin
859992d66f2028824ecece7c3e4f0544a5ac7753adbbb676f31235ba06b6e2e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C6 5072 bytes
font_01_sfnt_off0000d5f1.bin
f66ff4ab2c16e503e8660bbcfdb7742f4004269ef1cc6e3e9cb06794b6c6cd2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F1 10780 bytes

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