Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d94eb65ef49dee…

MALICIOUS

PDF

106.8 KB Created: 2021-02-15 03:05:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 635a0e90535cd18b123327541694e9ab SHA-1: e8078d79dcbcb4d16d04b03df1fc5ff7c6505147 SHA-256: 54d94eb65ef49deebd2267a49a36fe2ab633f70bbcbfad2cf983f198e2000964
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links forming a link farm. The embedded URLs and the PDF structure suggest an attempt to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the PDF's nature points towards a phishing or SEO-based malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=frank+zappa+quotes+politics+entertainment PDF link annotation
    • https://cdn.sqhk.co/tabuguran/majjQii/tambourine_instrument_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/IjhjcKq/machine_gun_preacher_documentary.pdfIn PDF document text
    • https://cdn.sqhk.co/mitajaso/eRjftS2/warpath_game_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/yghxhft/the_ice_cream_parlour_kendal.pdfIn PDF document text
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/giletife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420018/normal_6012914d22325.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/4jd3f6k/co_bylo_grane_w_4fun_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/geruxibab/igjfy9U/47966755944.pdfIn PDF document text
    • https://xitirume.weebly.com/uploads/1/3/4/3/134392652/3801342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411935/normal_5fe78ad955632.pdfIn PDF document text
    • https://zabidikigez.weebly.com/uploads/1/3/4/5/134594795/3cc32daed71.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/Lfijnia/border_patrol_checkpoints_phoenix_to_san_diego.pdfIn PDF document text
    • https://lijogidatu.weebly.com/uploads/1/3/2/3/132303170/1691800.pdfIn PDF document text
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/wusopej-wefezadurawij-vineraloroxuli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001559f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1559F 5276 bytes
SHA-256: 84ee17b372a2117e1a39b01409b972bd433b111e3fa299abf9b6ecddd45a14ad
font_01_sfnt_off0001678c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1678C 16856 bytes
SHA-256: 85eb9e26b1d9923a4b8985b063c3b2c71799abf6cec94f4147054c7a110a4857

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