Malicious PDF — malware analysis report

Static analysis result for SHA-256 a983e18929df5de8…

MALICIOUS

PDF

73.4 KB Created: 2021-06-06 12:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ca6e8afa9a5c4806c7c49358844d9b6 SHA-1: 300b342d294c8bf48bf746055b337862b5e9422f SHA-256: a983e18929df5de8656ac5903e5e07261a73e58387ae708b0a4fb125a64ab111
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting a malicious intent to drive traffic to potentially harmful sites. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of many external URLs points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/123?utm_term=sikadur+42+epoxy+grout+data+sheet
    • https://samarobiratepiw.weebly.com/uploads/1/3/5/3/135327643/4938486.pdf
    • https://zomubotedop.weebly.com/uploads/1/3/0/8/130873922/3206309.pdf
    • https://temadugebunexi.weebly.com/uploads/1/3/1/8/131871621/mevuxinu-saripagu.pdf
    • https://cdn-cms.f-static.net/uploads/4366309/normal_604acb1a5400a.pdf
    • https://dudunubute.weebly.com/uploads/1/3/4/1/134132035/d019521133.pdf
    • https://volifaredibeg.weebly.com/uploads/1/3/1/4/131437601/luwug_kofesiw.pdf
    • https://cdn-cms.f-static.net/uploads/4385869/normal_6068037879a60.pdf
    • https://cdn-cms.f-static.net/uploads/4485799/normal_60352eff5f803.pdf
    • https://cdn-cms.f-static.net/uploads/4416940/normal_60b7af81b939f.pdf
    • https://cdn-cms.f-static.net/uploads/4482413/normal_60271d8933f2d.pdf
    • https://cdn-cms.f-static.net/uploads/4419441/normal_602f10c4546de.pdf
    • https://static.s123-cdn-static.com/uploads/4428083/normal_5ffd2f3b6017a.pdf
    • https://mawegovif.weebly.com/uploads/1/3/5/3/135319367/tajuv.pdf
    • https://zojajodasu.weebly.com/uploads/1/3/4/3/134354616/xonolipelifo.pdf
    • https://naputurezakir.weebly.com/uploads/1/3/4/4/134485320/346542.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://visetululiv.pbworks.com/f/magnavox_universal_remote_code_for_tcl_tv.pdf
    • http://kufugaref.pbworks.com/f/easy_way_to_get_feebas_platinum.pdf
    • http://bovojigu.pbworks.com/w/file/fetch/144425481/wasukevije.pdf
    • http://finebov.pbworks.com/w/file/fetch/144472941/jurowugukadasoberol.pdf
    • http://zubipuwaf.pbworks.com/f/40990555843.pdf
    • http://motekus.pbworks.com/w/file/fetch/144691587/42083961102.pdf
    • http://movovepavuzi.pbworks.com/w/file/fetch/144699030/where_can_i_get_a_free_keto_meal_plan.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_off0000dae9.bin
948a7e2a93eee95168d9717968b7a2cea9c15d38a07a8d3d9840dc5e51eb40a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 5748 bytes
font_01_sfnt_off0000ee8b.bin
8f7fbdbded16785c3a5a145595feab6a18d32dc476babbce062dea68ae0829f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 11832 bytes

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