Malicious PDF — malware analysis report

Static analysis result for SHA-256 af05d82ed94bd325…

MALICIOUS

PDF

71.2 KB Created: 2021-02-14 17:02:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7e8b820b4241ac09b54ef64a02978527 SHA-1: e108ca6b64a33d0c77fd7fd44c51baec87f2ebcd SHA-256: af05d82ed94bd325bec435ecd6d771d3a7bb515965de8e1c4cf7bac525a300c8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, indicating a link farm strategy. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the primary goal is to redirect users to potentially malicious or SEO-abused external sites.

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://bologen.ru/aws?utm_term=gana+balachander+new+video+songs PDF link annotation
    • https://bamebifubakuta.weebly.com/uploads/1/3/1/4/131408159/luvoguzojuzolujunilu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385421/normal_6007a6bca8761.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494435/normal_5ffad9ac1f5ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383928/normal_60257a7e6d188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500893/normal_6023c76bd9414.pdfIn PDF document text
    • https://dozojabipow.weebly.com/uploads/1/3/4/0/134012686/3282167.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482848/normal_5fdebe8b373e7.pdfIn PDF document text
    • https://jeludumekidi.weebly.com/uploads/1/3/2/7/132740852/02625133faefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369927/normal_5fe8251e52beb.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/bivuniwokijesawipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369912/normal_602381a60eb58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417528/normal_5fca971e31a76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456399/normal_5ff857e78fb80.pdfIn PDF document text
    • https://letezinujafi.weebly.com/uploads/1/3/4/9/134901841/fabur.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/sizadagazagaj/15002767958.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/photography_business_card_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/goxivilorikejasijulexezik.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/bittorrent_win_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/mijelogirusukasik.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_off0000d6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B4 5524 bytes
SHA-256: cd1b21773e0719f8ad53fdb5e22ef85e6e3c3f37b14a276972b9a1fa4fe43a71
font_01_sfnt_off0000e988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 11380 bytes
SHA-256: 668ce7289158bc6098281c0cfe2f3bd8e54a88c7f5e3993b706202127b2850c7

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