Malicious PDF — malware analysis report

Static analysis result for SHA-256 515e67aa8ab21d9a…

MALICIOUS

PDF

66.3 KB Created: 2020-11-25 23:07:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 88b4bbb989f4e4e7c0f36192bcfdc4e0 SHA-1: 1704b5c58805a49bdc33f77769a4e572eff2a84f SHA-256: 515e67aa8ab21d9ac0de7e247eac9fbb2b32b6bcd0e95a264e04bb8092019cc7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and potentially a phishing trojan. It contains numerous external links, suggesting a link farm or SEO poisoning attempt, with one prominent link pointing to a URL related to a free download of 'Hallmark card studio 2019'. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate a likely attempt to redirect users to malicious content, possibly leveraging embedded JavaScript for obfuscation or execution.

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://trafftec.ru/strik?utm_term=hallmark+card+studio+2019+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f87279008cd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405925/normal_5fa7f6437076d.pdfIn PDF document text
    • https://vumukawa.weebly.com/uploads/1/3/4/6/134662430/vogig.pdfIn PDF document text
    • https://dagevonedil.weebly.com/uploads/1/3/4/7/134736192/7041dc.pdfIn PDF document text
    • https://juzumefewuw.weebly.com/uploads/1/3/4/7/134766708/vejowuxiruma.pdfIn PDF document text
    • https://pifujikis.weebly.com/uploads/1/3/4/8/134875168/kamopetawosuka-figapaju-zujizifas-ziwakujuvele.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/fodose/aplikasi_convert_to_word_android_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/tutikofavarumawosatewima.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/heart_broken_punjabi_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/befevifa/21113003460.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/fufejupefowatosagemore.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/disovokuwami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61a7c666-8de9-4934-8dc7-14901b056446/86424199055.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_off0000c4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A2 5768 bytes
SHA-256: f004980445b12062e5a3b80e681517a6584fc723da04641506014b1c57e3cacb
font_01_sfnt_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 10644 bytes
SHA-256: 6854baef55e994e529e0d85bfff98ba61cccf4be565df344dd96928823b4fb35

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