Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffa6a361e334fce…

MALICIOUS

PDF

80.0 KB Created: 2021-04-05 12:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: af6b1a44133934de063c1f4e355c2e78 SHA-1: 27e18901407df052ebf66b544c5b577411ed4e28 SHA-256: 5ffa6a361e334fce543e25df05dd8aad475e7b53c08a8cf9c7268f06013479b6
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to redirectors and a link farm, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a tactic to disguise malicious links as legitimate downloads. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=dave+ramsey+budget+spreadsheet+template PDF link annotation
    • https://cdn.sqhk.co/puwipaneke/hWgicha/verbe_avoir_en_anglais_forme_negative_contracte.pdfIn PDF document text
    • https://zawamobapuve.weebly.com/uploads/1/3/5/3/135383520/bipijate_xonakoxa_gusado.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/hix1NpC/nasalogatori.pdfIn PDF document text
    • https://kavisovilige.weebly.com/uploads/1/3/5/3/135308643/gaserakeret_lisurowedafawa_tagirag.pdfIn PDF document text
    • https://lesezisuwo.weebly.com/uploads/1/3/4/1/134109364/5973546.pdfIn PDF document text
    • https://vonojatu.weebly.com/uploads/1/3/4/7/134711894/486b4f444.pdfIn PDF document text
    • https://cdn.sqhk.co/bijilixiger/7e7jijb/91339188410.pdfIn PDF document text
    • https://fizemovumevomuf.weebly.com/uploads/1/3/4/4/134491325/suwebizofawu_nizebi.pdfIn PDF document text
    • https://wegusolojemirub.weebly.com/uploads/1/3/4/5/134597015/54ce2cc2e5.pdfIn PDF document text
    • https://cdn.sqhk.co/bafiweba/gj7zjb5/1682692382.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/dD0FalG/dog_pen_and_run_for_sale_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mubefula/is_inductive_bible_study_good.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/13097126671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb814599-17f2-40a7-97b3-4b4d8c11f3b4/lopopubuganexune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f4a5884-6469-45ab-b8a2-29b0c286ea5a/14900878682.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/bbc_uktv_tv_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/21728829380.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/caltrans_traffic_report_san_diego.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/tigida.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/marlin_60ss_.22.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8bce64a-57af-413c-8505-aa671c34ee2f/aqa_science_gcse_physics_textbook_answers_nelson_thornes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6b6cdd6-2aaa-4810-84a7-dfc9b5ad424d/47339461529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c719238a-eef4-4820-9932-c807ccbc4a99/uke_tunes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 5292 bytes
SHA-256: 1c5c4e0253fb0ca8798272227fad3c54be0ee8ee089e58851c209171bc6c320d
font_01_sfnt_off0000fd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD51 11484 bytes
SHA-256: e1b3ce8b2b293bb8a0c9c2c26c2cf2deef0df1af4e5cd5d8795461d38a215e01
font_02_sfnt_off0001243a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3