Malicious PDF — malware analysis report

Static analysis result for SHA-256 162ad52a5a273c4f…

MALICIOUS

PDF

76.8 KB Created: 2021-02-14 17:45:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 7acb7f29f36da0db1158c8ba2b26f511 SHA-1: 35a71b02208ba8403025a28343ebf24a6f177dd6 SHA-256: 162ad52a5a273c4f3c45021d90051ed606fc4f0e22efaf31d56de1ef631dad33
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/wb?keyword=anti%20acne%20mask%20sheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369643/normal_5feb97ae6f3f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_602907d6ce4f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403814/normal_5fe2afff27a70.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/jhnjbjf/train_brave_podcast.pdfIn PDF document text
    • https://kuboteradaragi.weebly.com/uploads/1/3/1/4/131482952/8630046.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421943/normal_600aacdc3932c.pdfIn PDF document text
    • https://tuwavufubuxa.weebly.com/uploads/1/3/3/9/133997694/tezatuvopupujax.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/ge5heyI/lipowizoxemo.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/7oVhfgf/53835943243.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486368/normal_5fefb8f280408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486354/normal_6010a35a2778b.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/tidigudetefumof/adobe_spark_invitation_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/medical_admission_admit_card_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/topics_in_classical_automorphic_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/kutit.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_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 4964 bytes
SHA-256: 39fdf27ec330614107f70b5d0b7e79fcbd10d3338ca56c1313bf6676c2b65576
font_01_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 11292 bytes
SHA-256: 330060ab56781bb102214ac804c3ab8ad3c3b63bc2803d8c86ceaf2169de27fd