Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc878c3d8b3ae72…

MALICIOUS

PDF

77.2 KB Created: 2021-04-29 23:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0e233582fbe413ce692231d80b325472 SHA-1: e259d07f525a96ea0862b545275968d7be32d820 SHA-256: dcc878c3d8b3ae72d983507f4cf1ae0668c420e6cd40362dcde20f6fd1392159
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic PDF_SEO_LINK_FARM indicates a high volume of links, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The presence of external URIs and the overall structure point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://jottigo.ru/strik?utm_term=power+pressure+cooker+xl+cooking+ribs PDF link annotation
    • https://cdn.sqhk.co/vekuperik/5OZrAQ1/head_soccer_world_cup_2014_weebly.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411270/normal_5fc5855d52716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426269/normal_605f63b339f97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464730/normal_5fe7e8823a633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465250/normal_6019ac79b1c8b.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/gh0ghhg/world_empire_2027_mod_apk_free_tokens.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwipem/kbPPhcV/goxapigoxobinibir.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/ibxyH8I/stickman_archer_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_60507e005484e.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/Kje3A78/qr_barcode_scanner_app_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_600be891bb82d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370051/normal_5fe34b1fc1561.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_d9ca86ff50084f2a88c5bbb1de370b6e.pdf?index=trueIn PDF document text
    • https://5a20c861-23fd-468b-888e-078c5342874f.filesusr.com/ugd/924841_aa82f586223446b8984c5084c79f6cb8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd94fb41-7d03-47e2-90a6-c8af3f687efc/which_furniture_brands_are_best.pdfIn PDF document text
    • https://b24182fa-1fee-416c-9f57-41d8a36573e1.filesusr.com/ugd/1cc367_0ece6e2f9d4e4633b8119be06195a2ae.pdf?index=trueIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_f8260cfad50b4b01919da53c8a000db9.pdf?index=trueIn PDF document text
    • https://9329dc78-1a6b-4cc7-98ac-1b36262b7dd5.filesusr.com/ugd/d2be55_baa7e1317c9344dc81eb740db8f2dae8.pdf?index=trueIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_b6bd628b27504860a9727f9c2a461eb5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aee80bc-07f4-4aea-b62f-5ee888a91b4c/will_rangers_apprentice_become_a_movie.pdfIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_d27f7469f85f48dba8331c6bf0401b28.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_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 5256 bytes
SHA-256: 192fdcbdf053c378a59d0a24b6da7fb4a2e7b825525dbb75a6f18935d8d7ccb1
font_01_sfnt_off000101b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 11196 bytes
SHA-256: d928dc1a984ddc9a1dafbf0f0b620c4691dd471426a24d85bd06e5e67e28edf0