Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c42d81ef51885ef…

MALICIOUS

PDF

78.4 KB Created: 2021-02-27 11:28:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 6fba5fb3b8844c6867453dbf252e89f8 SHA-1: 66f8f3224853adbf5b7552896f9845bfadf50650 SHA-256: 3c42d81ef51885efbe0b4415269de4fd6752e24d7ec3a4108f51ed7d9c513f54
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The embedded URI and the primary detected URL suggest a lure related to search engine optimization or potentially phishing. ClamAV detection and ML classification confirm its malicious nature, indicating it's likely a trojan designed to redirect users to malicious sites.

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://resalured.ru/award?keyword=does+wireless+keyboard+work+with+samsung+smart+tv PDF link annotation
    • http://katorewudejizut.22web.org/cinder_book_summary.pdfIn PDF document text
    • http://cabinetshub.xyz/41734404597hhxl2.pdfIn PDF document text
    • https://segunimumise.weebly.com/uploads/1/3/1/0/131070895/maroxo-sejuxudurilinak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370054/normal_600011673e328.pdfIn PDF document text
    • http://texukajiz.iblogger.org/hp_photosmart_c7280.pdfIn PDF document text
    • http://phrensy.co/7_words_not_allowed_on_tvomckk.pdfIn PDF document text
    • http://vifijes.22web.org/waporovo.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/jazofi/97259778937.pdfIn PDF document text
    • http://fojofediwesifog.rf.gd/72637866241.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/majesew.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/86785353858.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/rs3_p2p_fletching_guide.pdfIn PDF document text
    • http://vulekagezefodek.rf.gd/vetidiwidof.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/ielts_fever_listening_test_15_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/53387633612.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_off0000f658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 5696 bytes
SHA-256: 5d67965bfca2f22ff709ac3d36bd0cd945f8c8fe76cc66361bde4aa03497eb13
font_01_sfnt_off000109ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AE 10196 bytes
SHA-256: 79328a42fb1405ac71f5dc2b4e4723ffb88d25df61997bb3412f743eca33f6c6

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