Malicious PDF — malware analysis report

Static analysis result for SHA-256 f979caf979984bf3…

MALICIOUS

PDF

75.1 KB Created: 2021-03-16 07:08:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c32d87e9a872676ddb86a17de1c9e676 SHA-1: 3bb8f2e95478384abb20286dff92c489c570b0c2 SHA-256: f979caf979984bf3e816c3a79dc7f0362c7a00fb569cf66f4c498a969479a43e
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external links points towards an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

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://lozipotod.ru/123?utm_term=scientific+laboratory+report+example PDF link annotation
    • https://cdn.sqhk.co/wevemugas/Ahjgjjj/zombie_offroad_safari_hack_download.pdfIn PDF document text
    • http://sallehub.xyz/bluestacks_for_pc_windows_xp_sp328ic7.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/0ihd1jh/98553123470.pdfIn PDF document text
    • https://cdn.sqhk.co/susojitigi/jTghvuo/like_a_boss_seth_rogen.pdfIn PDF document text
    • http://neditaxuvim.getenjoyment.net/21152416881.pdfIn PDF document text
    • http://bikomowaxibujoj.medianewsonline.com/best_online_data_science_masters_programs_india.pdfIn PDF document text
    • https://cdn.sqhk.co/rujuwawuju/3iaLYin/lufukikudunozosu.pdfIn PDF document text
    • http://m-laskin.ru/36614567253v5am4.pdfIn PDF document text
    • http://wonder-ita.space/beyonce_songs_free_20159ec2a.pdfIn PDF document text
    • http://coolstudent.space/xufumafoloziripebujofy57mq.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/siijdo8/jozitetibudowadubaweka.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/e8ffedad-928f-4c11-b633-07cb95016301/wufejozavekavedufesuruf.pdfIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_0de40ae5dfc74aed910a42f6b37f1530.pdf?index=trueIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_22b9ba8a550e464ebb023d11a2e52208.pdf?index=trueIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_357359a081a84893996ab5f8fed7b53e.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_0edeea003ac24cd296d7a6355ede088f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56051f3b-c47e-4af2-8474-a13580333bcc/23687402522.pdfIn PDF document text
    • https://f621ecf8-e26c-4db3-9bdf-176eeceb312d.filesusr.com/ugd/b3755e_e80bc730508b4cec8b10ae4211a98cd8.pdf?index=trueIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_9469bd724edd4cc99e2ba82709e4b74b.pdf?index=trueIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_fde39ccc5e6642c9b93dd3de1d8c79a7.pdf?index=trueIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_8a02ebc777ba46cfbe00efeff5ca5c3b.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_off0000e90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 5396 bytes
SHA-256: 1d0b64183733f38f1e3ca913bd670a426747bb7d24b1ab011bbcb70b5cb80879
font_01_sfnt_off0000fb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB69 10528 bytes
SHA-256: f82071717be20b49f05858095e124fcefcb43b8a0c44b361e089784faebee8ce