Malicious PDF — malware analysis report

Static analysis result for SHA-256 4005b0ccbd1d0756…

MALICIOUS

PDF

94.0 KB Created: 2021-02-14 04:10:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b57f36d3675de2379996e813da8e86cc SHA-1: 79e48a71310e3edc6ed07859c830b97f6995c36f SHA-256: 4005b0ccbd1d0756006f5ab518f65fe7b8fad7406ae01854d348edcf209049b2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, indicating a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure suggest an attempt to redirect users to potentially malicious content.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=jedi+consular+kotor+build
    • https://zelivetatop.weebly.com/uploads/1/3/0/8/130814581/namud-vurizimi.pdf
    • https://nuzozixajalupik.weebly.com/uploads/1/3/0/7/130739607/tomikuvib.pdf
    • http://pupijepu.22web.org/business_plan_bookshop.pdf
    • https://sudoxelavekif.weebly.com/uploads/1/3/5/3/135305243/fonubixo.pdf
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/laxigowavuzunegu.pdf
    • https://maselevajaf.weebly.com/uploads/1/3/1/3/131398143/mopavow_zibekirese_gupuf_vorogamomelav.pdf
    • https://runuwafulisejet.weebly.com/uploads/1/3/5/3/135337902/wugeri.pdf
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/bumepenu-lirunuletezazix-sigupaj.pdf
    • https://gexaxiwiwa.weebly.com/uploads/1/3/4/4/134480231/zobima_konifosulix.pdf
    • http://jogubewuzamofet.iblogger.org/39930829215.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://duzavito.epizy.com/big_fish_games_full_version_apk.pdf
    • https://s3.amazonaws.com/lixisariwulo/10110607476.pdf
    • https://s3.amazonaws.com/jojitagifuva/isaimini_tamil_movies_2019.pdf
    • https://s3.amazonaws.com/zumezeviwakiz/bump_of_chicken_gekkou_single.pdf
    • https://s3.amazonaws.com/teximikamukubo/information_technology_manager_resume_template.pdf
    • https://s3.amazonaws.com/tajimipojimo/tropico_6_building_guide.pdf
    • https://s3.amazonaws.com/podawakumepewez/63217450210.pdf
    • http://gilasorizarer.rf.gd/bollywood_movies_2018_new_release.pdf
    • https://s3.amazonaws.com/vunizi/aiou_date_sheet_b._com_2019.pdf
    • https://s3.amazonaws.com/liwara/76135554998.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_off000135dd.bin
0cd01524df71ee591d0aec97b359d133520d92794650a5c3a880806912d7a5d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135DD 5128 bytes
font_01_sfnt_off00014757.bin
0deb5d75bfd5b27bd012e0a8a692a00e5dab625ea3933b5097d7e2bddfe311ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14757 10472 bytes

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