Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ae2353c980aefd…

MALICIOUS

PDF

77.5 KB Created: 2021-05-19 01:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a9a5c52ec8f70aaaa0953770486cfac5 SHA-1: 2e382ca0aec4e851c367c5d8d0531772c848b308 SHA-256: 38ae2353c980aefd2b12e743a2aaeeacedbc28b41510ff7f9c0f4c8c5972f892
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, many of which point to disposable hosting services like Weebly, suggesting a link farm or phishing operation. The heuristic firings indicate the PDF is a malicious redirector and link farm, with one URL specifically noted as malicious. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=how+to+put+together+a+nordictrack+treadmill+1750 In PDF document text
    • https://zovarufegurer.weebly.com/uploads/1/3/4/6/134625168/d0b4b9665f142.pdfIn PDF document text
    • https://wixumiwob.weebly.com/uploads/1/3/0/7/130776296/visarexiparo_gelisipesati.pdfIn PDF document text
    • https://jifafaxima.weebly.com/uploads/1/3/1/8/131871415/tojapotumigat.pdfIn PDF document text
    • https://jojumevowe.weebly.com/uploads/1/3/4/3/134314985/4625927.pdfIn PDF document text
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/4a2e802.pdfIn PDF document text
    • https://xavubetikobu.weebly.com/uploads/1/3/4/4/134474291/jawiwigopim-xavugalesiteno-wunesexijid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419626/normal_6063d1269ce26.pdfIn PDF document text
    • https://budorezaru.weebly.com/uploads/1/3/4/8/134859022/mabutobori-zukem-danamoxupi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_5fd60d64d3ee1.pdfIn PDF document text
    • https://kenafowipadile.weebly.com/uploads/1/3/1/4/131437871/muxidolejovude-mepololopiji-vubonat.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/luposos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381102/normal_5ff2d63ee9d0e.pdfIn PDF document text
    • https://jitivafume.weebly.com/uploads/1/3/0/9/130969372/7941859.pdfIn PDF document text
    • https://talegojozafadi.weebly.com/uploads/1/3/2/3/132303005/60d50562d8.pdfIn PDF document text
    • https://rajotabew.weebly.com/uploads/1/3/4/3/134360909/voraviv_xabapikes_gelasoxegewo.pdfIn PDF document text
    • https://jopuwijexanubuf.weebly.com/uploads/1/3/0/8/130874501/4dcbf4165ca0.pdfIn PDF document text
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/vabaxedo.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/0d00ae6c-df5d-496d-8237-c0859d9ad0a5/aircraft_maintenance_planning_jobs_in_dubai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae4a06f-e73b-4419-ba3f-3176fad3f0c8/21_day_eating_plan_to_lose_weight.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_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 5824 bytes
SHA-256: 07bcc178a7602023b52f21ed65b162ca40118f2b6b41d9f71c95e7c53c8dd908
font_01_sfnt_off0001020f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 10752 bytes
SHA-256: 910a80466d93df7d380e2a9ed189f9a626e88b468b0e820278c564ea87e71f58