Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca58b5c4be252d70…

MALICIOUS

PDF

73.7 KB Created: 2021-04-26 11:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: da0d7fb6e7fa79fb4de8dec5b7af4ce7 SHA-1: 39fa58c7f2888098c2e8e6c8d51dd0b948e74707 SHA-256: ca58b5c4be252d70f4fca0e40dbc7bc383066cd763285981e642a6debfb6550b
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many of which point to SEO redirectors and appear to be part of a link farm designed to lure victims. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' specifically identifies an eBay impersonation lure pointing to a redirector, strongly suggesting a credential phishing attack. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://warogowi.weebly.com/uploads/1/3/1/6/131606132/7166708.pdf.
  • 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://maypoin.ru/strik?utm_term=where+can+i+donate+furniture+now PDF link annotation
    • https://warogowi.weebly.com/uploads/1/3/1/6/131606132/7166708.pdfIn PDF document text
    • https://wesafave.weebly.com/uploads/1/3/4/3/134307961/lenano.pdfIn PDF document text
    • http://sdfafq.info/converging_media_5th_edition_free_download5e2in.pdfIn PDF document text
    • https://cdn.sqhk.co/rarirawibowo/1eYjdhg/light_trails_ios_app.pdfIn PDF document text
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/9168119.pdfIn PDF document text
    • http://repair-foto.ru/pidejudodisaxirowonitbs0.pdfIn PDF document text
    • https://fusesekomufe.weebly.com/uploads/1/3/1/6/131606177/9e34757f032d5.pdfIn PDF document text
    • https://kimuximufa.weebly.com/uploads/1/3/4/1/134132687/rederejiwo.pdfIn PDF document text
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/8483934.pdfIn PDF document text
    • http://badge-verification-center.com/how_to_get_math_symbols_on_google_docsgpqhp.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/eLMihgi/78021558060.pdfIn PDF document text
    • https://gotenalonas.weebly.com/uploads/1/3/4/3/134372716/jevuwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_cef5f3b4c559421c97a7130a3dd71e16.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fogibi/typewriter_repair_austin_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/1936868682.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/87203194927.pdfIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_9c333482ae634c468cc3be94f843605a.pdf?index=trueIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_756a98baddb1449fa921c6cc593f91f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/following_directions_worksheets_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/zavujuzelatupinikoseweza.pdfIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_1f3916e0bf1a43bf8e192f518b432a85.pdf?index=trueIn 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_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 5004 bytes
SHA-256: b05ed5d8614340848fa2dc9257f155514569f2a1ca4dc1695dfcb8b60a3e730b
font_01_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 10840 bytes
SHA-256: 9f3ddb8f528a8568ce292055809991969217f0cd80d948e0091b9651e0acb283

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