Malicious PDF — malware analysis report

Static analysis result for SHA-256 543d81e10c2ab9de…

MALICIOUS

PDF

70.7 KB Created: 2021-06-01 18:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 104fbf76b3a902b22bbfac7e3777a3d3 SHA-1: eb2e91373467e45d9c6a8170a2b745d1e63df61b SHA-256: 543d81e10c2ab9de3ca4a273afed1d29b5adbbfce568e07eb4d580a07bc4af1b
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain. The PDF's structure and embedded content suggest an attempt to redirect users to malicious sites, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nomylo.ru/pbw?utm_term=piano+r%2526b+chord+progressions+chart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475859/normal_6028b3605d9c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451574/normal_6003db9a30d92.pdfIn PDF document text
    • https://likotemeg.weebly.com/uploads/1/3/4/4/134464786/1774187.pdfIn PDF document text
    • https://xupulepil.weebly.com/uploads/1/3/4/3/134322414/dejekixujokejop-vosiwi.pdfIn PDF document text
    • https://gejizataki.weebly.com/uploads/1/3/3/9/133997606/konovukem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420031/normal_5feb402f9fe42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kokoxudalux.pbworks.com/w/file/fetch/144426546/comprehension_passages_for_grade_7_cbse.pdfIn PDF document text
    • http://xiwitanul.pbworks.com/f/21178113948.pdfIn PDF document text
    • http://faxamom.pbworks.com/f/61332438656.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144418101/what_is_inner_transition_metals.pdfIn PDF document text
    • http://sajateves.pbworks.com/f/gejupowoditemexujemapoki.pdfIn PDF document text
    • http://fadoposapat.pbworks.com/f/66350136435.pdfIn PDF document text
    • http://wixugigir.pbworks.com/f/download_rockstar_activation_code_for_gta_5.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144420921/how_long_is_the_osha_10_test.pdfIn PDF document text
    • http://savavaze.pbworks.com/f/afrobeat_hip_hop_instrumental_download.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_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 4472 bytes
SHA-256: 85a1c37e09756433d7c650df8599265e9270100c192d4923a67fa91fc97a3161
font_01_sfnt_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 10820 bytes
SHA-256: 540ddd2093e4e1b4dde9dab262817bbad878d97ff410a646a768b1babce2d016

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