Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f325b8923a97bf2…

MALICIOUS

PDF

94.0 KB Created: 2021-05-28 16:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 79a47610c611f0c6c0c310fbed6c2e49 SHA-1: 752c4822d03532adfa45f31362349643adcdff4b SHA-256: 3f325b8923a97bf28a245ee62453994fbb097757b735da0f6d9576e154b1e987
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 0.9989

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
  • 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://maypoin.ru/123?utm_term=choir+song++alan+walker PDF link annotation
    • https://jobeluraxofedir.weebly.com/uploads/1/3/4/3/134317239/bc7c316ce9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424405/normal_5ff189ba47753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404984/normal_6065a5bf3af98.pdfIn PDF document text
    • https://worojuwoxalo.weebly.com/uploads/1/3/0/8/130814432/1035019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411270/normal_605d538452291.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450160/normal_60013905606c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422645/normal_5fde57944ca4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474979/normal_606ae6e78f3f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_605d7077dcf17.pdfIn PDF document text
    • https://mewuvonemifutu.weebly.com/uploads/1/3/5/3/135394867/badb43a0734c1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427282/normal_6012e378d80c6.pdfIn PDF document text
    • https://tojetipa.weebly.com/uploads/1/3/4/2/134234581/torafanota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410415/normal_5fe6d4b75497f.pdfIn PDF document text
    • https://bofuvuwowu.weebly.com/uploads/1/3/1/8/131856225/pomej_nagirolovadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408866/normal_600cb4192d1b5.pdfIn PDF document text
    • https://jotesufuxave.weebly.com/uploads/1/3/1/4/131483421/6763c1a1366.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/612d9652-6acc-480f-8d82-4a2e6cd4479d/in_vitro_rapid_diagnostic_test_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfd613f4-f252-4218-b251-459c9aa26efd/flammable_cabinet_dimensions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce2f3c89-74a8-4871-80f2-d013f7718560/what_is_kants_theory_of_aesthetics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68aee44b-59e0-4e80-99df-70cf311c12fa/46523025436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96083e09-310b-40d5-91da-7c5db5bdb4db/nugunajozapur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/755ebfe2-bbe0-45cd-a30f-a53a56e5b3b6/6461241351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a98c3da-ddd2-4081-9a2c-bb0d668ecc7e/ancient_greek_timeline_bce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a244432a-ed75-4d8c-a6d4-d8e446d5cdd1/how_to_recharge_a_ups_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c30e740-052e-414c-9010-a75e74216614/tumonepobunokufoga.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_off00011ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE9 5624 bytes
SHA-256: 4f76bf4280bc163938130802f0b86da6b83ef8d49fe26b7becabd160a2f87721
font_01_sfnt_off00012e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E51 5008 bytes
SHA-256: 791fadb25a1e4f6e38d1de8cb5094a095ecf77eaf2291df451f3bf52142c3df1
font_02_sfnt_off00013f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5E 12792 bytes
SHA-256: ba958498b575eb5ac55908b9a1c61de8e8accfdef79de56d774ca9dbdb7129e4