Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f0b588b431e1c3…

MALICIOUS

PDF

72.2 KB Created: 2021-01-12 14:58:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0947b80a241971e02671fd8f87fb9364 SHA-1: 781de43bc7f0bf8c81b39a1a52560916b1ee9414 SHA-256: 44f0b588b431e1c36f8a3dd546e177513cb89f3bc1c2d935de01783e7b2a03a7
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffine.ru/aws?utm_term=adverb+clause+list+pdf'. Additionally, a machine learning classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be generated by wkhtmltopdf, suggesting it might be a lure document designed to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffine.ru/aws?utm_term=adverb+clause+list+pdf In PDF document text
    • https://lovunekigip.weebly.com/uploads/1/3/4/6/134685916/dupopukogopeb.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/hhijPgc/uba_mobile_banking_app_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dimumaneda/jcFdieE/ultimate_car_driving_simulator_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/zih6Ohh/degotivukope.pdfIn PDF document text
    • https://cdn.sqhk.co/japewaturu/cKgibih/lipozomobuvik.pdfIn PDF document text
    • https://mubatizusilaboj.weebly.com/uploads/1/3/4/4/134475350/mumejeb_watunojalevuxip_veruwajimezad_wasakavutimuli.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/tanapilamaxi/18431638614.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/apex_legends_size_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/bodepova/kich_ban_van_nghe.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/xibep.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/amapiano_kokota_song_fakaza.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_off0000dd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD62 5340 bytes
SHA-256: 564bfde6133599fd6782355bbca2a81fbda9e30f9b235a70a49b252abf3729ea
font_01_sfnt_off0000ef9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 10804 bytes
SHA-256: bf33f5aea2be8ad09cf161d2e3a41b64884eafd9e5f5e19980f164e7915af76c

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