Malicious PDF — malware analysis report

Static analysis result for SHA-256 039638219c63691c…

MALICIOUS

PDF

70.7 KB Created: 2021-02-10 14:43:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 481b2f5b63dbde1d84a92d945d2d0cb5 SHA-1: 78c79510604c09d1254133cd0fdffbc86be62adb SHA-256: 039638219c63691c5def409e44a063fcfdb3e016e10ac17927e6a6382e72d74a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, characteristic of a link farm or phishing lure. The document body, though heavily obfuscated, suggests a theme related to social media messaging, potentially to trick users into clicking malicious links. No scripts were extracted, but the PDF structure itself facilitates the embedding of numerous URIs.

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 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://jacksth.ru/123?utm_term=how+to+unignore+messages+on+facebook+without+replying PDF link annotation
    • https://xezatitewifesel.weebly.com/uploads/1/3/4/3/134393938/nuxijekin.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/gcibhyc/87699006024.pdfIn PDF document text
    • https://cdn.sqhk.co/jajotulix/gpkDZij/8404028252.pdfIn PDF document text
    • http://xopatiz.iblogger.org/bulbul_assamese_song_neel_akash.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/MhdLsij/67660157189.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/nosepevozux/background_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/xusabetudolegojajejegiz.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/88296202143.pdfIn PDF document text
    • http://sanikivatuma.rf.gd/28995701567.pdfIn PDF document text
    • http://magelul.epizy.com/16677117395.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/51186922360.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/sagomumedowov.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/apple_store_from_other_country.pdfIn PDF document text
    • http://puxetixunelotaz.epizy.com/fusupapuwat.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_off0000d4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CC 5788 bytes
SHA-256: 94a8b0a5cb243916175307f3dcfb84aa630219ed310c692aa896461716a48ceb
font_01_sfnt_off0000e877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 10628 bytes
SHA-256: d33d6458dc2b5aafc381b2fd5973695f7f930034b070d9f018cf5011d70daf09

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