Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1c6d13d6cf143b…

MALICIOUS

PDF

83.6 KB Created: 2021-01-28 13:13:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bd6799723c98b290089c98140a0ec71b SHA-1: becf8e5631ccf41fe57c4117c25cc99a5b6a6174 SHA-256: af1c6d13d6cf143b25d8a98f1afff4fc1fbd304ea31eba73257e0a5dbf925ba6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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=spiderman+booster+seat+cover PDF link annotation
    • https://cdn.sqhk.co/vimewiki/ggfigge/65890064138.pdfIn PDF document text
    • http://golepikoxeware.22web.org/78005618344.pdfIn PDF document text
    • https://mixenabunagoxo.weebly.com/uploads/1/3/5/3/135320093/c775b2c.pdfIn PDF document text
    • https://zugimawaxudal.weebly.com/uploads/1/3/1/4/131410952/fefde3d8bbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_5fdbe01250b06.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pugagewuda.rf.gd/android_pay_not_available_in_your_country.pdfIn PDF document text
    • http://ledonapagemes.epizy.com/70074491066.pdfIn PDF document text
    • http://vojuzegi.epizy.com/pokibovalobufulalumura.pdfIn PDF document text
    • http://kubumoran.rf.gd/18229480517.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/bsc_third_year_chemistry_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/guskara_weather_report.pdfIn PDF document text
    • http://rowomasogig.epizy.com/best_tower_defense_android_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/bikirizu.pdfIn PDF document text
    • http://vufigenetusanu.epizy.com/2019_chevrolet_equinox_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/76686318920.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_off000108a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 5488 bytes
SHA-256: 62d14d7fb6b728017c7ff0b9cdd33d4f17848a3ba41631eda6dabf5abd9a4a61
font_01_sfnt_off00011b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B31 11488 bytes
SHA-256: b82c3b732248db6ae8e98bdd9bf38244125e4166a74a89231fde8e93c87a9651

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