Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff63a42a0f04446…

MALICIOUS

PDF

82.8 KB Created: 2021-01-17 06:33:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 659be279d6e1cbdf17028bfe9caebabe SHA-1: d4a66235e213cada3dd2f9b774de505252337cbb SHA-256: eff63a42a0f04446d5cf7931756fbb5155f36430c60e43aeb4e95fa2cc350a99
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://gettraff.ru/123?utm_term=swords+and+sandals+2+mills+eagles In PDF document text
    • https://static.s123-cdn-static.com/uploads/4426675/normal_5fe2b0e882385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488817/normal_5fe78fb7966c9.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/s5hi8gj/lekijebawo.pdfIn PDF document text
    • https://pozimetotekiv.weebly.com/uploads/1/3/4/3/134339641/terotefovisivu-zuvanajab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422640/normal_5fe5bd878b43e.pdfIn PDF document text
    • https://nolalitikobuno.weebly.com/uploads/1/3/4/7/134768790/vuworapidukabe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459163/normal_5fe8d6ffd8f96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f87ddf28a4fa.pdfIn PDF document text
    • https://tavebesu.weebly.com/uploads/1/3/1/3/131381332/b7d9bdf4c.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/zgiNnHQ/benudowinevevot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474206/normal_5ff01971c33f7.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/paropabaru/popcorn_popper_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/66637767246.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/18483641573.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/lal_chunariya_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/23107101599.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_off0000ffff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFF 5472 bytes
SHA-256: 620eeb6e677063e76b644fc59ad712d8bb9b4b3e51405859e174b16f4b399b12
font_01_sfnt_off0001128f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128F 15680 bytes
SHA-256: 3434870ba65243f3c8435abe60108ed5ad01d96c713510d241c6ac3be723a6ab

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