Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff75bc1bb816d1a1…

MALICIOUS

PDF

76.1 KB Created: 2021-01-13 18:02:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c0f3db71bdb07da84bd89de792ad026e SHA-1: a5d78e82ad8ab0fa0632888e2de548ee0788a006 SHA-256: ff75bc1bb816d1a199010a0cb50dd0d2941231ea81494a3fd3fc16f4d4271cea
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. This suggests an attempt to manipulate search engine results or redirect users to potentially malicious sites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier flagging it as malicious further supports this assessment. No scripts were extracted, but the overall structure points to a phishing or content distribution scheme.

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://traffine.ru/aws?utm_term=butcher+build+guide+heroes+of+the+storm PDF link annotation
    • https://xovonugobo.weebly.com/uploads/1/3/4/6/134688771/5718767.pdfIn PDF document text
    • https://cdn.sqhk.co/nadudegimew/gAiglhh/peppermint_candy_rotten_tomatoes.pdfIn PDF document text
    • https://site-1172347.mozfiles.com/files/1172347/rebuilding_paradise_movie_where_to_watch.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/zomuzigo/mejosenugudadisilejokuko.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/68062937111.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/15398381412.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/online_editor_remove_pages.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/codex_las_huelgas_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/valentine_movie_indonesia.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/welanep.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_off0000ee41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 5416 bytes
SHA-256: f6685cbf8aa3fadd19e558515970047abc4d0e81d5251ef85363115092a73a32
font_01_sfnt_off00010087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 10220 bytes
SHA-256: 0ac3327effd19a1f6b210ae714a60753eae058a688e616167fbe88211c334d39

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