Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0706c6aed0c758…

MALICIOUS

PDF

81.3 KB Created: 2021-03-17 15:59:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5dfb409aca04c6b8a39abde491166de4 SHA-1: cff8062e9d81e9c1ca83bc377ca0e6f0fd8df36d SHA-256: 3b0706c6aed0c758d01a33e545a92efb04ebb1a86da9228439c16344ee5f6fe9
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, directing users to numerous external URLs hosted on disposable domains, which is a common tactic for distributing malware or conducting phishing campaigns. No scripts were extracted, but the presence of multiple external links suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/award?keyword=laboratory+experiments+in+the+social+sciences+pdf PDF link annotation
    • https://cdn.sqhk.co/bojojiweg/jh6hhhh/88735358830.pdfIn PDF document text
    • http://dobikan.22web.org/5503834486.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/b2G00qV/pekod.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/gjGidjf/how_to_iron_a_shirt_collar_stiff.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/VfszOjg/39962435564.pdfIn PDF document text
    • https://cdn.sqhk.co/pobijejok/iacifqN/silicon_valley_season_4_episode_5_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/zugivakizo/e3KjgPR/zuwokiwogomokofef.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/h8kyOJw/happy_birthday_cake_photos_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/bOHifhj/evoland_2_review_ios.pdfIn PDF document text
    • http://dusosax.66ghz.com/futejizolukekemasun.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/wDhh8hj/billie_eilish_bad_guy_cat_cover.pdfIn PDF document text
    • http://winwites.space/87151097216exg65.pdfIn PDF document text
    • http://kefets.xyz/30252620096yri0i.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/ihjjBii/xasezugazesojefole.pdfIn PDF document text
    • https://cdn.sqhk.co/xezakomujar/Ejdidp8/scary_granny_teacher_horror_grandma_house_escape_room.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/YIihwyx/dragon_warrior_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mafozebowuveb.epizy.com/clasificacin_de_los_animales_vertebrados.pdfIn PDF document text
    • http://rivudokuji.rf.gd/35787097100.pdfIn PDF document text
    • http://ropofijegeja.epizy.com/acknowledgement_section_of_a_report.pdfIn PDF document text
    • http://nufakakifitoj.rf.gd/kaxafo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 5432 bytes
SHA-256: 012500288e6d7557d0a10b11903cbea1ee4b8ccf4bb532b3540b0fdc903e8442
font_01_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 11200 bytes
SHA-256: c519682fe9c2f5d49ea6b3a7f539add7e80c8ba06848bd097b25c0a053f2486f
font_02_sfnt_off000128e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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