Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace91bb15189882f…

MALICIOUS

PDF

71.8 KB Created: 2020-11-17 05:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6fa28ed55973747dd671dcf8d81e70a1 SHA-1: eed49e3620e51c9fa2e4549a24d59339615fec93 SHA-256: ace91bb15189882fe9782c558184ae81e0edec1e3eb4b5b32dfb42cea5b605ab
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 large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or redirection mechanism. The presence of a critical heuristic firing for 'PDF_SEO_LINK_FARM' and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent. The primary malicious URL identified is 'https://trafffe.ru/123?utm_term=how+to+smoke+a+tri+tip+on+a+pellet+grill', which likely serves as a lure or initial point of contact for further malicious activity.

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://trafffe.ru/123?utm_term=how+to+smoke+a+tri+tip+on+a+pellet+grill PDF link annotation
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/8239468.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/goxex-fuvebo-wudidasipomelo-fuluvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_5f8df0076c5c4.pdfIn PDF document text
    • https://nepajomawowezuw.weebly.com/uploads/1/3/4/4/134462508/99411295b3.pdfIn PDF document text
    • https://nejalebemenogun.weebly.com/uploads/1/3/1/0/131070187/f3dd0016115899.pdfIn PDF document text
    • https://rufijaduruki.weebly.com/uploads/1/3/4/3/134311805/5622ee3cfb3faa.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/sefaritonos-nukivafeka-retisebop-regaxumex.pdfIn PDF document text
    • https://xarisoxetawekox.weebly.com/uploads/1/3/4/3/134399368/c77be697f20fc5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/97276989476.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/89877486701.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/supply_chain_management_and_logistics_in_construction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de30182f-d091-46e6-822e-01f74b0dea01/71584870622.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/tidigusiwipinumemekirasip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9f8185f-6a6a-40b2-8880-6e7be4ca46df/puzowu.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/is_a_synchro_summon_a_special_summon.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC10 5256 bytes
SHA-256: ae7f889a5f35794bd90fd269244c9677adf6e75bf85a796bb16b556bbba0656e
font_01_sfnt_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 10708 bytes
SHA-256: f197de860ef16513b3c27db655feebb61d3544a6750f5b7db6a6e22c5efedb58

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