Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d36ac94e6948be5…

MALICIOUS

PDF

75.9 KB Created: 2021-03-21 12:06:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 144822e7df0d14595c27ff35cff7c9ab SHA-1: 52f52a667f2bc1125bf143ad0b1db326a0511452 SHA-256: 8d36ac94e6948be5fcdba04c3bb5dfd4f9671c298181e6839034216d7aae0c58
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to potentially harmful external 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://seumenha.ru/123?utm_term=make+text+bold+android+xml PDF link annotation
    • https://mesasijodise.weebly.com/uploads/1/3/5/3/135315214/757147.pdfIn PDF document text
    • https://cdn.sqhk.co/sojetaji/W2yEFgi/poor_digestion_medical_term.pdfIn PDF document text
    • https://tawugeri.weebly.com/uploads/1/3/4/7/134774142/ddc63e589.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/8Ugfdvx/5720900890.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/1wwTJE9/98307585725.pdfIn PDF document text
    • https://cdn.sqhk.co/mivesavif/RBMgjgj/nenufifuxugofumon.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/ogcieEp/sanitulofo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_02812fd3c01847588af82e418a0be275.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_deac88c87b1f47268b95634c8f1fc467.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_5b541e308eb7411eb891ff2f6cbdc00e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisute/acdsee_pro_9_full_version.pdfIn PDF document text
    • http://ripaziwewew.epizy.com/fufuwatusikofemurigegu.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/49645503635.pdfIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_83e033bc6b9240ed93e01422af228440.pdf?index=trueIn PDF document text
    • http://nusaruzedawuw.rf.gd/zinuludenuluruwakij.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/zefakodomebiwoxoxaf.pdfIn PDF document text
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_2ff417fe25ad44dab9b9bec827ab2770.pdf?index=trueIn 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_off0000e8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 5072 bytes
SHA-256: 2f4e943c9011eeda2bddb58b291323dd4fd18a44165f328eb0ce03f4d52554ff
font_01_sfnt_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 11344 bytes
SHA-256: 865e3127013d3e56958fba7e9968504ef11d825aa3e5c84fb9dfff0944a288f6

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