Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d35602f02c819be…

MALICIOUS

PDF

72.3 KB Created: 2021-02-25 05:39:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 096393e6b3764f2774e55c91aa86f1df SHA-1: 3335a1f97f3c70efc85aa8f3bb7eae43a441fa2d SHA-256: 5d35602f02c819be037c78163ab19c3f8fcf7224cf3be9ec64d4710997ed4ae2
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://bologen.ru/123?utm_term=how+to+activate+a+xfinity+cable+box PDF link annotation
    • https://cdn.sqhk.co/jigavozef/hjbS1ig/16569154588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451356/normal_5fd1ed359b417.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366034/normal_5fce4131a0abc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425511/normal_601ba2f841a49.pdfIn PDF document text
    • http://luwunizolidaki.22web.org/how_long_to_boil_sweet_potatoes_to_remove_skin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464873/normal_601185588cf32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382639/normal_6021f8641d894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_60138d1173e30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484605/normal_5feaf39f43edf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446147/normal_5ffbf7cc685e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529780/normal_6026044a2d4e9.pdfIn PDF document text
    • https://cdn.sqhk.co/vebiziwob/eggOgcL/nedisatepusumisek.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/bgc824W/wemili.pdfIn PDF document text
    • https://cdn.sqhk.co/dufukeraj/GibgfXj/aimpoint_pro_best_magnifier.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://losikamadan.epizy.com/free_printable_community_helpers_worksheets_for_preschool.pdfIn PDF document text
    • http://favekagopu.epizy.com/four_fold_brochure_template_publisher.pdfIn PDF document text
    • http://nusilelopalal.epizy.com/laptop_damage_report_letter.pdfIn PDF document text
    • http://nakepusigazu.epizy.com/61036417475.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_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 5024 bytes
SHA-256: 0ab5b1dfd3ff6d7fd4cd9709cf64a3ff3cdd3c3b7d6f835f65b66f21466de99b
font_01_sfnt_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 10036 bytes
SHA-256: 52e77691a13420e9a341171e39f3272145eced25a3dd182136178de31c9dd4ef