Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f0ab5001d31e17…

MALICIOUS

PDF

76.5 KB Created: 2021-03-14 16:25:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1bfe87beae6ba7d2cd74bac738804ba8 SHA-1: 22c9dba27b0272d7aa6c7677b36754d270a234de SHA-256: f6f0ab5001d31e175b99a46bfa05fbc37c2c8ce670455b188075d7d6f96e2294
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score. ClamAV also detected it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'small pdf splitsen' and award keywords, directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/award?keyword=small+pdf+splitsen PDF link annotation
    • https://mawakigimewu.weebly.com/uploads/1/3/4/8/134875352/5222664.pdfIn PDF document text
    • http://volanorirabu.22web.org/how_many_horsepower_is_a_2015_mustang_gt.pdfIn PDF document text
    • http://amsidisi.xyz/what_size_is_30_waist_in_womens_jeans_uk9gh1w.pdfIn PDF document text
    • http://stebsmeh.space/the_lottery_shirley_jackson_storyps3sq.pdfIn PDF document text
    • http://mebelrostov.ru/english_grammar_class_5_worksheetsz56ed.pdfIn PDF document text
    • http://mnclassis.org/watch_dogs_2_mod_apk_revdl8d94w.pdfIn PDF document text
    • http://venira.su/2127349444m0tj.pdfIn PDF document text
    • https://junezemojevav.weebly.com/uploads/1/3/2/7/132740237/3125241.pdfIn PDF document text
    • http://tekplafond.xyz/when_god_winks_at_you_barnes_and_noblenoxc2.pdfIn PDF document text
    • http://realnoe-obshenie.online/love_yourself_highlight_reel_piano_sheet_musicltsh6.pdfIn PDF document text
    • http://erse.xyz/how_long_do_i_cook_a_12_pound_turkey_in_a_roaster7wt8k.pdfIn PDF document text
    • http://nijaxubazaziw.mypressonline.com/fexeluneriravuk.pdfIn PDF document text
    • http://chistohome.moscow/victory_services_club_address60tdb.pdfIn PDF document text
    • https://vefonero.weebly.com/uploads/1/3/1/0/131070196/dad2680.pdfIn PDF document text
    • https://nuzewotamomumaf.weebly.com/uploads/1/3/4/7/134701518/79f6d4f77fe25a.pdfIn PDF document text
    • http://datab.vip/xotaginh4am.pdfIn PDF document text
    • http://buybritishcat.com/957147867389v2s6.pdfIn PDF document text
    • http://idealica-italiaoficial.site/69064950333dpn31.pdfIn PDF document text
    • https://gereveporona.weebly.com/uploads/1/3/0/7/130775593/182779.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/harbor_breeze_mazon_ceiling_fan_light_bulb_replacement.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zewadajimenu.rf.gd/zisivi.pdfIn PDF document text
    • http://tiredosutozol.atwebpages.com/afcat_2020_official_notification.pdfIn PDF document text
    • http://gonegexunu.myartsonline.com/nirebemosogoxuxomozav.pdfIn PDF document text
    • http://pedirite.onlinewebshop.net/fumerukunemabu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 5192 bytes
SHA-256: 358bf95566d541328e1ab6a84bff77e8d0abdc1a4aa181d55352c8daefe2e46b
font_01_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 11132 bytes
SHA-256: d092e69ebec3a7e76126e75e141ab03573399a4d5d05339ddff12ddfd38428b4

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