Malicious PDF — malware analysis report

Static analysis result for SHA-256 c823b7aaad09d06d…

MALICIOUS

PDF

90.3 KB Created: 2021-04-07 21:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 635fddeabc0281483e7c722bd5a64a03 SHA-1: 12be38d9759398d56eec0a91508b1ace56f293b3 SHA-256: c823b7aaad09d06def22faa677d92cab63d29fafe1743fe18da030e4869377fc
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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.
  • 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://crophysi.ru/wix?keyword=wordly+wise+3000+book+8+lesson+15+answers PDF link annotation
    • https://zinaxavum.weebly.com/uploads/1/3/4/3/134354277/zimatusojo-sedosoxof.pdfIn PDF document text
    • http://leree6.club/xuwusuz54zk.pdfIn PDF document text
    • https://vufujisuwe.weebly.com/uploads/1/3/1/4/131437295/ratotoginozemumak.pdfIn PDF document text
    • http://disconto50.pro/jigikofususzqy2.pdfIn PDF document text
    • https://xovomono.weebly.com/uploads/1/3/5/3/135345708/63a59316d469.pdfIn PDF document text
    • https://gavuwili.weebly.com/uploads/1/3/1/0/131070236/fanofimevebeti_somivunagakuvop_nenetepekik_fupaga.pdfIn PDF document text
    • https://sukifife.weebly.com/uploads/1/3/4/3/134334287/suvoperutuletu.pdfIn PDF document text
    • https://sovufejado.weebly.com/uploads/1/3/0/7/130740048/4497829.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/639532.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/OjjVzjc/maxxis_pace_vs_ikon.pdfIn PDF document text
    • http://mifvideo.space/the_developing_person_through_the_lifespan_11th_edition_free3nb0o.pdfIn PDF document text
    • https://cdn.sqhk.co/zijopenuxafi/0Q7geic/nasal_spray_for_sinus_infection.pdfIn PDF document text
    • http://dostafood.xyz/facebook_local_dating75hx3.pdfIn PDF document text
    • https://narefipikabisip.weebly.com/uploads/1/3/2/6/132682930/3d36b0168a98934.pdfIn PDF document text
    • http://1green.space/duxegewlns7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec51d519-26dd-4775-844c-cb22132d7591/diono_radian_rxt_booster_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0271dfd-58b6-4e7a-93c5-266db83ccc3b/rufipiratodoruzimonowotan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63193782-b786-49ee-85fe-8bb2a70041bd/42515782071.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4203099-9a4d-4331-9ed6-e6c1f8fb484b/63740937629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b8716dd-eb38-4970-9846-80b3e57afbb7/zuvowamixegufudivez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4feb4fd6-594a-424d-9df6-26edb8d4d4a1/star_wars_the_force_awakens_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/281f1567-3679-44a6-88bc-fb6316e183b7/director_of_service_management_job_description.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_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 13812 bytes
SHA-256: 8df0b9e051baa1dbb4d287d3e2587ccdad705ba38561f8545e9cb6c39bef81ca
font_01_sfnt_off00012165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12165 5908 bytes
SHA-256: 1bf512a6c1b74b414b49a34bb02832d406c79d9b3d8e8eaa7345170fbeaa7c99
font_02_sfnt_off000135ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AD 10984 bytes
SHA-256: c91b191ec530a48cdb394352a36c14bbcdf7c0ec919b7a15c9291f256e5d367f