Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf737f25f75d0a6…

MALICIOUS

PDF

71.4 KB Created: 2021-01-10 11:34:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d9a9530fb008255382e2c5e9d6dc0405 SHA-1: efe885337eb236190c92b6139481ab30fbafa648 SHA-256: 1bf737f25f75d0a6879d2f993bbaf5fd191c5a82271fce5c595d95621f633c1e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, suggesting a link farm or redirection scheme to host malicious content. The embedded URLs and the PDF structure strongly suggest an attempt to trick users into visiting malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?utm_term=things+that+start+with+z+around+the+house PDF link annotation
    • https://site-1180277.mozfiles.com/files/1180277/30710647537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f9bb9e98eab2.pdfIn PDF document text
    • https://lupunudarowujak.weebly.com/uploads/1/3/4/5/134599946/077ee272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452853/normal_5fa585af44cd9.pdfIn PDF document text
    • https://cdn.sqhk.co/dudumadopole/izbPjj7/24500688535.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/L7RRjjj/8140619478.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458124/normal_5fec4d9ee04aa.pdfIn PDF document text
    • https://bemogipe.weebly.com/uploads/1/3/4/3/134379528/dememi.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/lanaladu/alice_in_wonderland_soundtrack_2010.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/55563048354.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/vijuvalatorajawubafo.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/55020811116.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/69478845096.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_off0000ce9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9F 5028 bytes
SHA-256: ac23807e85a842d847cc6ad51619b914e60befc98a15c6e2d3d471f48c39b44f
font_01_sfnt_off0000dfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBC 10236 bytes
SHA-256: 9f680aaf6fd2ba01dd4bd4d581aa4fd63237b91b75ba33d5e57e4a3b81712562
font_02_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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