Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9aee9b4fa9cacc…

MALICIOUS

PDF

78.3 KB Created: 2021-02-16 20:52:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ac79fa8e552f0556b741552fe34f5319 SHA-1: a2d76129f63bfa19cfa0ee6a8f0acff22c679a5c SHA-256: 1c9aee9b4fa9cacce71c0d85deb888a382fcc6903279c2b7bd37ee2c80a00704
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' lure further supports a malicious intent. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=avatar+musik+world+money+mod+apk+unlimited PDF link annotation
    • http://trokot-tonirovka.online/senoleki78hs.pdfIn PDF document text
    • https://xesamubi.weebly.com/uploads/1/3/4/0/134095888/1453160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479707/normal_6026d66a5710c.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/9250158.pdfIn PDF document text
    • http://pubguckazan.com/sony_music_center_app6ou71.pdfIn PDF document text
    • https://zabidikigez.weebly.com/uploads/1/3/4/5/134594795/7470495.pdfIn PDF document text
    • https://tiruvodeg.weebly.com/uploads/1/3/4/8/134892329/7aa625b70058.pdfIn PDF document text
    • https://baxuzofagebem.weebly.com/uploads/1/3/1/3/131381850/remugi.pdfIn PDF document text
    • https://nemoderi.weebly.com/uploads/1/3/2/3/132302766/2b843f59.pdfIn PDF document text
    • http://whalesqpa.fun/gacha_club_characters_edits3krc.pdfIn PDF document text
    • http://lightstart.xyz/58020526653re4zu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409403/normal_5ff14ab81e042.pdfIn PDF document text
    • http://mail-autoscout24.net/26140801309g85n6.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/popisiburewixuj/bf_skinner_biographical_information.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/47035988645.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/93002174744.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_off0000f584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF584 5412 bytes
SHA-256: cbad1c7963a08074b9f23036e85f82b0559c8d5884b3418793fbcdb3b8042567
font_01_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 10412 bytes
SHA-256: f2795db79c3983a05fef3997cf80b25797e5d8b791d7960f521d7a284042c38a

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