Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aaf5228e65b2cc7…

MALICIOUS

PDF

75.7 KB Created: 2021-03-03 11:09:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4acedcc9ed53d8e7fb1f4e29ac9de9bb SHA-1: 1defad63905303c714f2c0589e8704911f7075ea SHA-256: 3aaf5228e65b2cc72127e7707d48f7e18f63dc62877b54ee7c17dfa30ae4ee12
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=is+greenworks+pressure+washer+a+good+brand PDF link annotation
    • http://boldly-grow.com/one_click_unbrick_tool_xdaceiud.pdfIn PDF document text
    • http://my-favshopg.online/19908612762bc8ja.pdfIn PDF document text
    • https://kisofoga.weebly.com/uploads/1/3/1/3/131383553/3703751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388412/normal_600fc8e132b28.pdfIn PDF document text
    • https://cdn.sqhk.co/dizukenepu/ghcihjd/betazokodekozefo.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/hVhdja4/carshield_warranty_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/remokuvupen/jjVciae/razas_de_perros_chiquitos_y_tiernos.pdfIn PDF document text
    • https://cdn.sqhk.co/bonosexov/highf1U/play_last_card_online_freecell.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453344/normal_5ff463e7cb15c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380073/normal_60059410597e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_601db65417341.pdfIn PDF document text
    • https://fosovumukudire.weebly.com/uploads/1/3/4/2/134235423/127e1ec.pdfIn PDF document text
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/vojadizotupuram.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sobegomogi.rf.gd/smart_card_reader_software_for_android.pdfIn PDF document text
    • http://pozadel.epizy.com/tesukep.pdfIn PDF document text
    • http://leporib.epizy.com/incursion_room_guide.pdfIn PDF document text
    • http://xegubidutanaza.epizy.com/california_residential_rental_agreement_form.pdfIn PDF document text
    • http://mevonaku.rf.gd/41996234456.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_off0000eca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 5424 bytes
SHA-256: b8cfdb5176dbde33ae42cfbdcb19fc07dfff5b62430e9ad568db0719f81b9aa2
font_01_sfnt_off0000ff23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF23 10176 bytes
SHA-256: 8e63a5b48bf95ff94830296e58fe34de7db63b3a783192685794c97c8bebc871

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