Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ebe3c997dcc9ad…

MALICIOUS

PDF

60.2 KB Created: 2020-12-21 03:00:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0544b9b251cc5d5f505d84e7ab64d24f SHA-1: c7c7dc328cf293d0f4a55943820f48ec01716061 SHA-256: b8ebe3c997dcc9adaaff3a3527e61708e866b9b60ac56095cde295f0d1aa3ba0
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs pointing to disposable hosting sites, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, indicates it is presented as a PDF related to 'symptoms of being human', a common lure for phishing or scam operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafffi.ru/123?utm_term=symptoms+of+being+human+pdf PDF link annotation
    • https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/4e971b64.pdfIn PDF document text
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/772324321d52ebc.pdfIn PDF document text
    • https://wimugedi.weebly.com/uploads/1/3/4/7/134725841/gewibomelun-tupeperobatejel.pdfIn PDF document text
    • https://pinukozemaf.weebly.com/uploads/1/3/4/7/134713375/mubunenu.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/jawemepuwiwifisuluf.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/2484834.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/6878281.pdfIn PDF document text
    • https://mekuluvuxagol.weebly.com/uploads/1/3/4/5/134589608/banikitit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zalomi/simmons_6x20_protarget_rangefinder_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7454b607-d7c1-432a-af7e-9172a63cd752/62561660175.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_off0000aff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF8 5672 bytes
SHA-256: d60bca64c4844908903805c07cc9eea41924aa4a0fc87d4322772c44bbc00643
font_01_sfnt_off0000c31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31E 9872 bytes
SHA-256: e977e75b7f06320e44cd9a726f5f87047c618437b831d91fd2d732068a63d366

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