Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1bae289ca043f3…

MALICIOUS

PDF

70.9 KB Created: 2021-03-19 13:11:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a0acdd6305bbd98de534e61e89ff0050 SHA-1: 27d54665612b49b2a401163c9b72667e10547fd0 SHA-256: db1bae289ca043f3c6b74bc5b57c317942bd3fa18c3041f93478608df5d2a61a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URLs and the nature of the heuristics point towards a malicious document designed to redirect users, likely for 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://leonvi.ru/award?keyword=pasar+de+pdf+a+word+descarga+gratis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393346/normal_5fed823121911.pdfIn PDF document text
    • https://lekaretuzej.weebly.com/uploads/1/3/0/7/130738752/2336678.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420248/normal_5fde5eba71eee.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/jiFuid6/57063377540.pdfIn PDF document text
    • https://tobosuxonekid.weebly.com/uploads/1/3/4/4/134493818/9333576.pdfIn PDF document text
    • https://cdn.sqhk.co/bobimugura/5fQeMgd/85438620604.pdfIn PDF document text
    • http://medefoduma.iblogger.org/1116398840.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/wowonesoribu/gangstar_game_free_mobile9.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/6936461338.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/wavepad_apk_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/udemy_er_chrome_extension.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/68714666779.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/wosowoj.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/rimoxaguw.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/nawubipitikivofum.pdfIn PDF document text
    • http://fixiwerasame.rf.gd/cool_powerpoint_templates_2018_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/4100643787.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/51360657675.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_off0000c9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C7 5068 bytes
SHA-256: 8d35fb46abc98663b8302061fe214f8093e37f30b9e46dc47b4324c72264cde8
font_01_sfnt_off0000db29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB29 10636 bytes
SHA-256: 76b851597f4364f510b994777095536b38646d02964177330dd2d9a524ae2db2
font_02_sfnt_off0000fe42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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