Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb046ba819785ff…

MALICIOUS

PDF

78.8 KB Created: 2021-06-02 13:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: edf4974241aa7236dfaa237078b10352 SHA-1: 5e6b2439ce1bd7c35b926105674da955bfd169b2 SHA-256: 1fb046ba819785ffa8ed755b7f255ccbda2be9b12d932ab6c9602a26cb7435bb
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to 'crysiq.ru', which is presented as a search result for intermittent fasting. This suggests a social engineering tactic to drive traffic to a potentially malicious site. No scripts were extracted, but the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crysiq.ru/pbw?utm_term=what%2527s+the+best+way+to+start+intermittent+fasting PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463538/normal_605e013716a34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458615/normal_603a06b56e0b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374188/normal_604d8a795d779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462073/normal_6056db759bda2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453732/normal_60004a049e429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471234/normal_60330be1eb776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_5fd7b5a7218ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kapetipubi.pbworks.com/w/file/fetch/144426477/10424096106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43b543a3-4da6-4354-b362-2028751e9656/hound_of_the_baskervilles_1983_dvd.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144424434/debajenebejibipipexomuge.pdfIn PDF document text
    • http://polubisoxuwo.pbworks.com/w/file/fetch/144504969/toro_recycler_22_maintenance_manual.pdfIn PDF document text
    • http://xovakovawup.pbworks.com/w/file/fetch/144487350/vision_pro_8000_commercial_installation_manual.pdfIn PDF document text
    • http://nefusim.pbworks.com/w/file/fetch/144443838/cracking_the_act_reading_test_answers.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/1570599106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fdb557b-1c75-4f2e-9d8d-314b4cbf2928/19445796684.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/w/file/fetch/144427326/zudado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d899702-80ba-4d35-b570-8d03d96baf19/newoja.pdfIn PDF document text
    • http://veniwusuj.pbworks.com/w/file/fetch/144502416/67796889737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/194ea5cd-5ad2-4425-83ba-f614b507af6f/vizio_s3821w-c0_review.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/batman_arkham_knight_ps4_tips_and_tricks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d15e6d33-fabb-4fa3-8722-8f47486a05bf/a_treasure_trove_of_short_stories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7a7931b-e8f4-426f-bac5-86580cb2c123/client_service_coordinator_job_description_banfield.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_off0000f4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B4 5528 bytes
SHA-256: 78616437a3d4d1bbe0854e9b9221641dd8369efb1e453e4822d993b377953070
font_01_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 10612 bytes
SHA-256: f0cb80efec0d8567df470ec6100c04652553819fcf45e0344f29fe2b8fae0b52

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