Malicious PDF — malware analysis report

Static analysis result for SHA-256 1245a201bd76aa9f…

MALICIOUS

PDF

79.8 KB Created: 2021-02-12 21:31:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4dbbea378634a06c4df21cf7e4d2b919 SHA-1: 4a24c611a0c0228564f6bd6bae742b99c4e68f3c SHA-256: 1245a201bd76aa9f81decd8f0fb925efed2f6f7c7df1eed1f951c6487dae4901
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, suggesting it is designed to direct users to numerous external sites. One of the primary external URIs points to a URL that appears to be a lure for Christmas festival information, likely a phishing or scam pretext. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

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://maypoin.ru/wb?keyword=christmas%20festival%20information%20in%20english PDF link annotation
    • http://lomizagin.iblogger.org/sheet_metal_gauge_thickness_mm.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/jdfqijm/gubefalirulinotilemosoz.pdfIn PDF document text
    • https://cdn.sqhk.co/wetabupi/bgcgjgi/33699457925.pdfIn PDF document text
    • https://razomidubijime.weebly.com/uploads/1/3/4/3/134395635/fiziwifajupaduzebi.pdfIn PDF document text
    • https://mupililoxer.weebly.com/uploads/1/3/5/3/135302313/1ae12eba6.pdfIn PDF document text
    • http://laxeded.iblogger.org/12565330637.pdfIn PDF document text
    • http://comforfemj.fun/nemowilimaginesizabilozijgbscc.pdfIn PDF document text
    • https://gikanirirexenad.weebly.com/uploads/1/3/0/7/130776133/nirako.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/vifusupegiza/ccna_guide_to_cisco_networking_fundamentals.pdfIn PDF document text
    • http://dijutago.rf.gd/28126766981.pdfIn PDF document text
    • http://balupamujoti.rf.gd/60462912734.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/mobuxot.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/bofozipaweselawasesotam.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/2458150861.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/acerose_password_vault.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_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 5052 bytes
SHA-256: 0cd98e92ffa8aacd25776002402d67d2337e12a16864f39c44c42ec29e05a16a
font_01_sfnt_off0000ff65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF65 10620 bytes
SHA-256: b308a30985cfddc9f54f84847074fd6713f52f7e3dad862f20642749455f662c
font_02_sfnt_off000123ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CE 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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