Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca364f3b1ad175dd…

MALICIOUS

PDF

77.9 KB Created: 2021-02-15 11:18:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 28b60506819d0fbbf8d7bbd0bb030268 SHA-1: 8ed3e5c498879463e7909d31ad7326199d64aee7 SHA-256: ca364f3b1ad175dda5a56bef1aac4eee86e8beafa743a20663bfe6254efa4bb6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, with the primary heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The embedded URLs suggest an attempt to redirect users to potentially malicious or SEO-abusing content. While no scripts were explicitly extracted, the nature of the link farm and the ML classification strongly indicate a malicious intent, likely related to phishing or malware distribution.

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=flannel+crib+sheets+safe PDF link annotation
    • http://socialwave.me/non_spore_forming_bacillijaq7y.pdfIn PDF document text
    • http://poopo.ru/army_height_and_weight_standardswtn7m.pdfIn PDF document text
    • https://velalozelo.weebly.com/uploads/1/3/4/4/134498802/vixibuwetulapofimu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470542/normal_60061e21ef37f.pdfIn PDF document text
    • https://sigajijatikad.weebly.com/uploads/1/3/1/3/131379485/608f38e162544.pdfIn PDF document text
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/wanufisolu.pdfIn PDF document text
    • https://burakatotofok.weebly.com/uploads/1/3/1/8/131871829/433140.pdfIn PDF document text
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/silepidumi-gonisudura-kizekuberejof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ralomefin.epizy.com/thriller_album_video_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/70174856090.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/powukaxajopajekupu.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/hyperosmolar_hyperglycemic_state_management_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/godom.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/eagles_injury_report_week_17.pdfIn PDF document text
    • http://rigitusavogu.epizy.com/98523863459.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_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 5064 bytes
SHA-256: 6b0bf3f017f786c558a6f91f5753212d63166eefca72899321db30edb8a64c29
font_01_sfnt_off0001063a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 10696 bytes
SHA-256: 4e7e9744d3b5f20ac785ba760342b45c25b389a82184e52ee6115a8bf884d78a

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