Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ab542a781f89da…

MALICIOUS

PDF

83.8 KB Created: 2021-04-04 09:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: acfa273ca38cb152006467c93dbc4036 SHA-1: c3d4a5d372873c4f98a8cebf483c2e55bc4aab40 SHA-256: 04ab542a781f89da8cd86f6408c47cbb99553fd9999b256683a52b84da185159
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=sun+life+benefit+card+numbers PDF link annotation
    • https://cdn.sqhk.co/nulogoxeja/WhdJ37u/algebra_1_math_fsa_countdown_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/5haQig4/multicraft_free_play.pdfIn PDF document text
    • https://kusuxifitumaka.weebly.com/uploads/1/3/4/5/134593182/677a7b4100a.pdfIn PDF document text
    • https://mabunamu.weebly.com/uploads/1/3/4/9/134902385/divadanukawuwonizixo.pdfIn PDF document text
    • http://grizhoff.ru/xasezipaxomi7rt0v.pdfIn PDF document text
    • http://topvideo.design/uber_roadshow_presentationsfsng.pdfIn PDF document text
    • http://yoga-fitness.space/psc_bulletin_diamond_jubilee_edition_2018hn66t.pdfIn PDF document text
    • http://miiliioner.xyz/disturber_of_the_heartsvxuyn.pdfIn PDF document text
    • http://bridgecommerce.com/books_to_read_if_you_liked_the_bronze_horsemanvcqwh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_1ba43427fcf940f981e76143b1dc7e22.pdf?index=trueIn PDF document text
    • https://704d67de-a0ba-412a-a77d-f8c4cf0d88a3.filesusr.com/ugd/a83d94_2b4d33fb512e4ab3a495104af857e401.pdf?index=trueIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_9cebab04884a4ea48b06224bf211438b.pdf?index=trueIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_2bb329b075534dcaa088f6082b743006.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwisi/nikorikiranozusupik.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/best_thief_race_guild_wars_2.pdfIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_1109b536caa2411f9d637e7fd0e650a3.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 5408 bytes
SHA-256: abd5d77ef64cca937792fafa590686a08816d779de1d36308c283a2df9e10053
font_01_sfnt_off00011616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11616 12552 bytes
SHA-256: 6a374fe6179c772037fd85e1e464f1207ea0bd1a29314ecf2955f91bc5e8d8c6

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