Malicious PDF — malware analysis report

Static analysis result for SHA-256 af94277d5f918853…

MALICIOUS

PDF

74.9 KB Created: 2021-03-19 06:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 97644adfbb3dbc1dc262c08329d0036b SHA-1: c60dde82a3b54b9c66bd5f872d350d4289dfef10 SHA-256: af94277d5f91885355ab0cc86e65fab07870053b70bc7d38838fbac69634f079
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 0.9996

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/123?utm_term=aoe+chong+hack PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411917/normal_603a1e92703a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424692/normal_5fe2b7c7b5e8f.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/c0jdjey/horizon_forbidden_west_initial_release_date.pdfIn PDF document text
    • http://usacreditmonitoring.info/epson_printer_xp_200_inkp9brf.pdfIn PDF document text
    • http://apkweb.net/lab_equipments_and_their_usesx6h5f.pdfIn PDF document text
    • http://mscredit.info/10165729645w6cjd.pdfIn PDF document text
    • https://cdn.sqhk.co/wanadujogo/1YPxwgf/adventureland_tickets_farm_bureau.pdfIn PDF document text
    • http://gravkamen.ru/gatubukabatusadisp9vkv.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/b8XjeJP/dimatipim.pdfIn PDF document text
    • http://gooddevice-online.com/wasimevegobafudiko4ppm.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/KiWagdB/gulavegetuxugineladukesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_5fe68ec41f62b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487641/normal_60436dc6c1df8.pdfIn PDF document text
    • http://sneakerspapa.store/inorganic_chemistry_books_for_mscksrit.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/is_diary_of_a_wimpy_kid_wrecking_ball_the_last_onetkrjs.pdfIn PDF document text
    • https://cdn.sqhk.co/gimowiboxero/ii7jege/dragon_quest_11_walkthrough_act_3.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/df2a87a9-2fe7-4054-8bc8-01b8e240efa1/pafosatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1233561b-7760-432f-9d47-095a191a9894/how_to_apply_the_secret_law_of_attraction.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/answer_usa_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6381b3a3-d342-4620-8d85-f96ca6af9d9b/37920477683.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/does_annabeth_chase_like_percy_jackson.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/certificate_of_insurance_form_explained.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0C 4808 bytes
SHA-256: b009ff7c0305cfc8a9a2632ceb79d4478539dd1445564cdbc03b85b549094208
font_01_sfnt_off0000ed6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 21760 bytes
SHA-256: 29979767e39eba7353e47e35ebe6e9b3bc273ba4fc4a488c1ea0eff9be6266bd