Malicious PDF — malware analysis report

Static analysis result for SHA-256 79adecec07a7e8cc…

MALICIOUS

PDF

80.7 KB Created: 2021-02-13 16:09:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b48dad13b43976c7116dd210c5a40aab SHA-1: 53ce859e6036bc8b00bd8908fdd2d166fbef0a3b SHA-256: 79adecec07a7e8cccd3e1634e2fd92f7b6f521c86b7c3fb88aebbbf1e9cde588
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL pointing to a site related to 'bosch washing machine repair manual'. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. The presence of embedded URLs and the link farm suggest an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=bosch+washing+machine+repair+manual
    • https://static.s123-cdn-static.com/uploads/4476288/normal_5fffe941ee265.pdf
    • https://static.s123-cdn-static.com/uploads/4413119/normal_5fe1c0a19ce8d.pdf
    • https://static.s123-cdn-static.com/uploads/4422136/normal_5fcedfef836c9.pdf
    • http://reduslim-sito.site/sujuwugewamorobogozupabuje7hzd.pdf
    • http://xruhdfo.site/vernier_calliper_reading8ppt7.pdf
    • https://nupuwumot.weebly.com/uploads/1/3/5/3/135305030/fb62e933cc3a55.pdf
    • https://static.s123-cdn-static.com/uploads/4369162/normal_5fe47cac3f7fb.pdf
    • https://static.s123-cdn-static.com/uploads/4505687/normal_6007d37685a3b.pdf
    • http://vknart.xyz/derokakokufezemanalmiibx.pdf
    • http://idealicait.site/bacteriophage_life_cyclek4fqa.pdf
    • http://sosyaltakipcipanelin.com/377725593118ojj8.pdf
    • http://rankingcoach-seo.com/pubejazajojikomupeve8ab53.pdf
    • https://static.s123-cdn-static.com/uploads/4405413/normal_5ffc2f41e6ba4.pdf
    • http://bijavamu.iblogger.org/laravel_blade_template_if_else.pdf
    • http://nekretnine.site/xumegukjv9za.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gujugune.rf.gd/suwaxijolinewujotujega.pdf
    • http://gonuwufif.epizy.com/kabaddi_score_sheet_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffb7.bin
7e8429d4e44fa01c249a7dcd12015e3f9521e12ee171c4e6f644b2c804be5a4d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 5488 bytes
font_01_sfnt_off0001124e.bin
24eac14c16e2b3edd7d0dc28f4a6b53fdf7438247a95c69145007203a931b43d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1124E 10240 bytes