Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a22b10d9e45c42a…

MALICIOUS

PDF

82.5 KB Created: 2021-04-24 11:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b765c8a454b05e30793876c101162b16 SHA-1: 58fdef43b3c64f704a54e25f8041db0a86d870c5 SHA-256: 7a22b10d9e45c42ab91a5af4caee2aafc38eadb61193c3aa19921bc3c09cf891
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 0.9995

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://dafemum.ru/strik?utm_term=american+history+textbook+11th+grade+pdf PDF link annotation
    • https://pebawozo.weebly.com/uploads/1/3/4/8/134865175/cf44a63daf3.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/zjeSibu/apple_watch_4_map_my_walk.pdfIn PDF document text
    • https://rupogasonewu.weebly.com/uploads/1/3/4/6/134653860/jarikexo_rexura_zonamewobop.pdfIn PDF document text
    • https://defosojuregoko.weebly.com/uploads/1/3/1/3/131383900/lokofawa.pdfIn PDF document text
    • http://okrasote.info/how_hard_is_the_drivers_knowledge_testtb1gs.pdfIn PDF document text
    • http://ouily.xyz/39767228792y44l7.pdfIn PDF document text
    • https://raxiruzaxulam.weebly.com/uploads/1/3/0/7/130738564/6297917.pdfIn PDF document text
    • https://mokekisinuru.weebly.com/uploads/1/3/4/3/134366850/78c80423f7f74.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/jjaSij8/simple_vanilla_cake_recipe_with_plain_flour.pdfIn PDF document text
    • https://cdn.sqhk.co/kidirugolo/btWUZji/3228057169.pdfIn PDF document text
    • https://cdn.sqhk.co/bufudoraxala/jbggiez/phase_10_world_tour_frames.pdfIn PDF document text
    • https://gopelema.weebly.com/uploads/1/3/4/3/134314553/mikixutat.pdfIn PDF document text
    • https://lejonelawubuw.weebly.com/uploads/1/3/1/4/131453657/e31aa35.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/GOOLgdB/pie_smart_tape_measure_for_your_body.pdfIn PDF document text
    • https://cdn.sqhk.co/pelebitebi/jfEjjjf/directv_app_login_help.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/jaBz8hb/gamestop_prestige_orange_city.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/Mogh6nv/71132948192.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/ieA1Hgj/mupibupipevirilazozofev.pdfIn PDF document text
    • http://dorightunion.com/bawesin28waj.pdfIn PDF document text
    • http://de-bewertung-889562.icu/cars_3_characters_names2ucuz.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
    • http://dosututoseres.rf.gd/invitation_templates_free_online_word.pdfIn PDF document text
    • http://fekepoloper.rf.gd/como_hacer_referencias_bibliograficas.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_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 5740 bytes
SHA-256: 5f04c6c1a9a36086f70f0d12dcb320b08ccd52983ffa84a0d8bba88968dcb92f
font_01_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 11272 bytes
SHA-256: 3c17a1c48a2df667a3c6d5817340c6fd7919707396367ea23079be724714b218
font_02_sfnt_off00012dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAD 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c