Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfc3ea0682b0d60…

MALICIOUS

PDF

89.4 KB Created: 2021-04-24 10:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 776e6e5be1e7a766ff028b658dca8db8 SHA-1: df0a6b7ec2dc5b9ad1d9160c3da9072ae576d77c SHA-256: 3cfc3ea0682b0d602befc5a18c8892823acb88dcb9816282c599da4fa77bc437
254 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector URL that is known to host malicious content. The heuristic firings indicate this PDF is part of a link farm designed to redirect users to phishing or malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=pretty+things+guitar+chords+kat+hasty In PDF document text
    • https://cdn.sqhk.co/limiwebu/hhh9V9Q/chilis_to_go_job.pdfIn PDF document text
    • https://cdn.sqhk.co/bulelovuroga/awkjhhf/junikixewaropuravenofogog.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzifixe/cR4Gias/evil_snowman_names.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/gjq0hcK/word_connect_level_151.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/jipowumat/gta_5_cheats_pc_free_money.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/best_overall_bosch_300_series_dishwasher.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/hp_officejet_pro_8620_e-all-in-one_printer_printhead.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/78676551948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f30a87ef-1a07-4d2f-a84e-92c649ecf893/2016_corolla_le_specs.pdfIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_417637a7011849cca114d779c82a7e8a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b404c3-92b3-4761-8742-b23c454af0d6/kinetico_water_softener_salty_taste.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_43b43192cde84e6ba996ef5943bd6bc3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/mathematics_probability_and_statistics.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/arsenal_vs_burnley_goal_highlight.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/aramaic_english_new_testament_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/vtech_cs6114-11_dect_6.0_cordless_phone_with_caller-id_black.pdfIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_83de365aff5843cca96f685d9d6300c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/abacus_level_6_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/red_lace_formal_dresses_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/dufusojo.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/langrisser_m_enchant_guide.pdfIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_81e10e94581e45b4a6730aba00b0ef62.pdf?index=trueIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_05d31a0bfb464d6e9d2fc395bc83f44b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pisedij/kashikomarimashita_destiny_answer_facebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4152642f-82d7-4b22-b3cc-c704b0f02d5e/a_cuanto_equivale_1.50_metros_en_centimetros.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_off00011133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11133 5220 bytes
SHA-256: 9cc9b9fbd78e3e85285e03ab9c7e5476499e9f9242f41e1b7f77c8865a84b535
font_01_sfnt_off000122ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EA 11424 bytes
SHA-256: 972ed8550491f3a9204ffa06159842f781212079f5c2725793849c0c6670d8af
font_02_sfnt_off000149bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3