Malicious PDF — malware analysis report

Static analysis result for SHA-256 351390d41d18fc1b…

MALICIOUS

PDF

76.4 KB Created: 2021-02-21 21:40:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e2ad017adb68aa27c69fff0845431b33 SHA-1: faf3ddae6495d1ce19a4ecb5e8a57fb4522b7a7e SHA-256: 351390d41d18fc1bc1533b9cfb384488740b11dc9fa5abfc035f4d8599f7a985
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary URL, 'https://druttle.ru/123?utm_term=is+nbc+available+on+directv+now', suggests a potential phishing or scam attempt. While no scripts were explicitly extracted, the nature of the PDF and the high number of external links strongly suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

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://druttle.ru/123?utm_term=is+nbc+available+on+directv+now PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463287/normal_601bb4b0435c2.pdfIn PDF document text
    • https://waxutawuvesi.weebly.com/uploads/1/3/1/4/131455398/c00de398626b25.pdfIn PDF document text
    • https://tikuvafijosil.weebly.com/uploads/1/3/4/6/134685963/sugokigixonatipepi.pdfIn PDF document text
    • https://kazamudadi.weebly.com/uploads/1/3/0/7/130775411/kusobikiluvu.pdfIn PDF document text
    • http://jebumivusesujan.iblogger.org/bapuzolabawafize.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_6013308b0f45a.pdfIn PDF document text
    • http://abzac.me/95321375052oqpjs.pdfIn PDF document text
    • https://xulozajewe.weebly.com/uploads/1/3/1/3/131384688/fagapoladopatove.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446035/normal_6003ecd348d62.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/jolituzoji/tamifetuwilelunuvezo.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/rubber_band_sizes_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/mexusimavitelo.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/rainsoft_water_softener_price.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/tamilrockers_telugu_full_movie_2018.pdfIn PDF document text
    • http://daxotumolurotaw.rf.gd/du_b_tech_admission_form.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/dawutumelarebobo.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/30228993797.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_off0000eccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 5160 bytes
SHA-256: a7007e009edcd1b556f99484b53e34d5cd3fa53a558a49875db9524ac78fb719
font_01_sfnt_off0000fe7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7C 11200 bytes
SHA-256: 41a60d3891cd19fb6da2ff30f35cfe679ae0785c3c5dfb9a911cd022b3820e62

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