Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ac2f59acb6bd4d…

MALICIOUS

PDF

64.5 KB Created: 2020-12-18 17:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c30373a814f923732c3ad69893f2c14a SHA-1: bfbfa21161796e326cd34d6f91deba18dabd5a8b SHA-256: d8ac2f59acb6bd4dc348a0bcc368a73b79b4965b11df2cffdb64cadbe506aa21
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to 'Peoplesoft user manual'. The presence of embedded URLs and the overall structure strongly indicate an attempt to redirect users to malicious sites.

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
  • 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://trafficel.ru/strik?utm_term=peoplesoft+user+manual PDF link annotation
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/lakidazopatuxo_regopikukugogux_vunokidone.pdfIn PDF document text
    • https://sulomotosepotu.weebly.com/uploads/1/3/4/7/134744650/wopogenanufoxepejuw.pdfIn PDF document text
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/a7f5558253f90.pdfIn PDF document text
    • https://vekatugid.weebly.com/uploads/1/3/4/5/134592715/63438fefd57.pdfIn PDF document text
    • https://zufuleruzu.weebly.com/uploads/1/3/1/6/131637307/botinuti.pdfIn PDF document text
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/2b9fb.pdfIn PDF document text
    • https://namukizup.weebly.com/uploads/1/3/4/7/134748015/49b54722e3.pdfIn PDF document text
    • https://togelugifipa.weebly.com/uploads/1/3/4/6/134648123/tepujazapizejo.pdfIn PDF document text
    • https://xemojunaxumig.weebly.com/uploads/1/3/4/2/134265853/lavuwawididul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f8bdda12a4b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f8ba230d8dbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E3 5048 bytes
SHA-256: 778c2d668004e04c5a8a14831a700a36ebcb8a71c48e6b6f8b775cf8a4aed347
font_01_sfnt_off0000d3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F2 9916 bytes
SHA-256: 4536c46476ba92bd5b5034ba81808e1e6191226f1013975f9bf6a53cbb754806

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