Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0717f6006812c1…

MALICIOUS

PDF

77.9 KB Created: 2021-05-30 07:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7fc5d5cff9e39b66e19eaf800ff5c88b SHA-1: 7185faeda9092233298a239da4ebb1b0acc951eb SHA-256: 8c0717f6006812c118a886a39e3a26880fd0c7c8587b81270b1fb3d6da1143fd
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 0.9991

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://jumiwimov.ru/123?utm_term=background+information+on+thin+layer+chromatography PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387420/normal_5fd340645bc0c.pdfIn PDF document text
    • https://baresifesej.weebly.com/uploads/1/3/4/1/134131831/butakoxojegixo.pdfIn PDF document text
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/2598375.pdfIn PDF document text
    • https://ligezuwokatajef.weebly.com/uploads/1/3/1/6/131606313/5c0151d29347ad4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476429/normal_6015443c8494b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496812/normal_5ff03135d36b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409621/normal_5fffb77a0cdf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_6031316c89a33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_604d6603e67f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464524/normal_5fe6977f6ce83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479921/normal_5fd2cb6fd3a02.pdfIn PDF document text
    • https://ranipevuzide.weebly.com/uploads/1/3/4/3/134366839/xadilebubaloraz-dikirifulusuzu-vefoxaveja-rirajawafiji.pdfIn PDF document text
    • https://nakosedamewa.weebly.com/uploads/1/3/4/6/134612328/f4d0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481836/normal_601762672674c.pdfIn PDF document text
    • https://vadinako.weebly.com/uploads/1/3/4/8/134893839/fa05316ddcac72a.pdfIn PDF document text
    • https://nafoxowozuvika.weebly.com/uploads/1/3/1/3/131383754/819027.pdfIn PDF document text
    • https://bafuzonexive.weebly.com/uploads/1/3/0/7/130739369/supaxiwumetijiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_5fdbd8f1db003.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/aa0da965-6655-4f64-8e6c-eebcb668c4e1/93510074125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f785f7a-b1c2-452d-b183-02949caa352b/zosowetaxejewezebeguv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50c9b8b6-cbe1-424c-985d-eae5c626e6ae/63064839385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05c870bc-facb-4736-a29a-a26cb0b83963/the_secret_life_of_walter_mitty_soundtrack_full_album.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932b4039-f25e-4bdd-97da-c2cdb040f83c/what_will_the_2021_mustang_look_like.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/518111f7-0118-44dc-aec8-5ad2375de37d/72497925978.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_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 5608 bytes
SHA-256: 115dd2909511841f366732cc9c9986041652c7c27d11a4ed9f3794934d4e14f0
font_01_sfnt_off0001057e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 10548 bytes
SHA-256: 51b570b215f198e3c7495ab0b724d5a1c8fcb536aae16a026151b05cef19f928