Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8779310c38a5bd3…

MALICIOUS

PDF

73.1 KB Created: 2021-01-13 12:39:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c67f5e6b3142281315b3a6f83a6cd2b0 SHA-1: d234c651eef97cd33bbd275d626a4c35960d56ab SHA-256: d8779310c38a5bd3c5bde80197764fb19f72ea9d5fe025064dbc8d7e9b070b69
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

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://trafficel.ru/123?utm_term=ryobi+electric+pressure+washer+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380859/normal_5f990c3411f3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_5fe72b58435a5.pdfIn PDF document text
    • https://site-1207400.mozfiles.com/files/1207400/80033164296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_5fbbe7ee15f31.pdfIn PDF document text
    • https://sulidisige.weebly.com/uploads/1/3/4/3/134318683/perisadetojiluda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367964/normal_5feb7eec26bd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382413/normal_5f9be1879235b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366036/normal_5fc731c13a924.pdfIn PDF document text
    • https://site-1180454.mozfiles.com/files/1180454/top_10_country_music_songs_april_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lukepepe/suzuki_cavalcade_lx.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/apnea_obstructiva_del_sueo.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/gadatunotutipovebam.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD218 5396 bytes
SHA-256: ad5afd10cbf64cea59cd69e72bd07878b512e031ed4c892fefd768a57220dd4c
font_01_sfnt_off0000e452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE452 11072 bytes
SHA-256: 64ec043223f41c4c03cf1aa86780326224289e6891f4767e1548b5ea61e030fc
font_02_sfnt_off000109d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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