Malicious PDF — malware analysis report

Static analysis result for SHA-256 42cf721f8e315703…

MALICIOUS

PDF

101.1 KB Created: 2021-03-26 07:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b52d75f82d42459e0481cca5e10902b5 SHA-1: 11cd040fb55ed66be1bbf53fd924048f5f35887b SHA-256: 42cf721f8e31570313fd755062d08b4f964d932044c07cd88046660b1cb2f040
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://nipisod.ru/award?keyword=bowflex+treadclimber+manual+pdf', is presented as a manual but likely leads to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/award?keyword=bowflex+treadclimber+manual+pdf
    • https://niniteju.weebly.com/uploads/1/3/0/8/130814631/0fc8e.pdf
    • https://lixijuzi.weebly.com/uploads/1/3/4/6/134626773/nukipulexu.pdf
    • https://nagobajega.weebly.com/uploads/1/3/1/3/131380413/pikapadojamipubawi.pdf
    • https://sakobapo.weebly.com/uploads/1/3/3/9/133999770/dawubi.pdf
    • https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/5779587.pdf
    • https://vebodejivab.weebly.com/uploads/1/3/2/3/132302978/57a4cd2c89b942.pdf
    • http://giveaway2020.info/fikubikipilijowigine5wia7.pdf
    • http://eushopvmn.site/sony_handycam_dcr_dvd108_manualdapoz.pdf
    • https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/kefuwulen_zodevekevixujul_liganuzefu_fuloxakarez.pdf
    • https://kodalisurodufe.weebly.com/uploads/1/3/2/6/132680932/dogitu_wogisogarepovu.pdf
    • https://dupopawo.weebly.com/uploads/1/3/4/6/134652833/9812239.pdf
    • http://barajofa.mywebcommunity.org/what_religion_uses_the_book_of_enoch.pdf
    • https://wuselusovofose.weebly.com/uploads/1/3/1/1/131164562/namufixijapedolun.pdf
    • https://genexezo.weebly.com/uploads/1/3/4/6/134616565/ludesojabina-totukakazo.pdf
    • http://xukewatamom.22web.org/54119315055.pdf
    • https://vunidiripoga.weebly.com/uploads/1/3/1/4/131453449/rivaxufojajesidaxal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sitidex.epizy.com/free_prefix_and_suffix_worksheets_5th_grade.pdf
    • http://pudolajuji.atwebpages.com/katojibuwinalegofol.pdf
    • http://wabalegawamiraj.rf.gd/63364097808.pdf
    • http://fesonukoropirum.rf.gd/notion_d_algorithme_informatique.pdf
    • http://tezofer.rf.gd/wilukaguguso.pdf
    • http://luregaw.onlinewebshop.net/academic_research_paper.pdf
    • http://muvekalufisu.atwebpages.com/lenovo_t430_hard_drive_removal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014009.bin
b30fa5f15e87a36290aad16fd01610f34fa3ca08de729fd57ab1aa5881f00ded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14009 5472 bytes
font_01_sfnt_off000152a5.bin
2a007dca61d8c48cd3d5adcf5280443754078b9dc28dfa80b378f84edb4547be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152A5 2092 bytes
font_02_sfnt_off00015bb7.bin
b0a166812aa4ff92371760c6956b4ece475488e1774d38d746148c9cf3e1ba92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB7 12304 bytes

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