Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f84c085bb453c19…

MALICIOUS

PDF

131.5 KB Created: 2021-03-25 21:25:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a30c30fc483748583c4a16dc9f90ed61 SHA-1: d68045838a451a91dde2daebe782783f4024797d SHA-256: 0f84c085bb453c190f3dced3f28a8b6b07d9feaab63a89e3fa5b94f35bfc274b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to seemingly unrelated PDF documents, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=characteristics+of+communication+channels+pdf
    • https://maparezoja.weebly.com/uploads/1/3/5/3/135321508/wudagipoxi.pdf
    • https://vogifidawavuda.weebly.com/uploads/1/3/1/6/131636702/309274.pdf
    • https://fanunidepaz.weebly.com/uploads/1/3/4/4/134474969/b3a0639e75c5b2.pdf
    • https://tasukivokojut.weebly.com/uploads/1/3/4/5/134592673/fopaduwu.pdf
    • http://xewuxufulizifu.22web.org/88509577563.pdf
    • https://tunejipurebodo.weebly.com/uploads/1/3/4/3/134342488/6994614.pdf
    • https://pejegenipejixe.weebly.com/uploads/1/3/4/8/134848799/duxinanivodoxifa.pdf
    • https://danivuzi.weebly.com/uploads/1/3/2/6/132681213/xesamupavobej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/11b27cef-1d9c-491e-8614-f824b8aa3e24/eragon_book_1_summary.pdf
    • https://uploads.strikinglycdn.com/files/fc804ba9-d1ec-4d32-a1e7-484f33dc1479/peter_and_wendy_cast.pdf
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_e1b35baa9b8442aeaa012bf3dcab412e.pdf?index=true
    • http://nenutufap.epizy.com/jolurewugeloka.pdf
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_e337ada0678e45889a2b1d414ee46131.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c0230c45-b46d-40aa-8dcb-f706b36649d3/vifizoxepewesiruletusa.pdf
    • https://uploads.strikinglycdn.com/files/60347913-e605-4528-bb84-d2dc02fa087e/what_is_the_concept_of_nuclear_deterrence.pdf
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_352fc28eb05943f79788c9f424177830.pdf?index=true
    • https://s3.amazonaws.com/zetubakuz/vazabegoravivud.pdf
    • https://uploads.strikinglycdn.com/files/eac3cbfb-ca7c-467c-8bcf-359cc5a87fac/nutribullet_rx_reviews_consumer_reports.pdf
    • https://s3.amazonaws.com/fogibi/16286454176.pdf
    • https://s3.amazonaws.com/wezukep/modern_digital_and_analog_communication_systems_4th_edition_solutions.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c228.bin
41d75bcee9ad39399841d9678dd28105799210db3e0a2a6d5e5db446d294f703		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C228 5300 bytes
font_01_sfnt_off0001d3fd.bin
dea5278abcb6c5f66f646c797908bcc4dcad551a806fcea5ca79f8b31c6d90f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3FD 13636 bytes

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