Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a1bf3b7736d7ba…

MALICIOUS

PDF

78.2 KB Created: 2021-03-04 03:22:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 9eadfdad7821f67ca69e5fe0a812d2a1 SHA-1: 82031bcd9efbcd83f1f278aa2ecd6ae3d462a5ce SHA-256: f3a1bf3b7736d7baaf7981d27e161b595cf0626c74dd10c18d03dca0d4b14fe0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic to various sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://lozipotod.ru/123?utm_term=how+long+to+cook+a+turkey+breast+in+a+butterball+fryer PDF link annotation
    • https://cdn.sqhk.co/jonimaze/a7r4PE4/maxanoxovubulasilokes.pdfIn PDF document text
    • http://tiktoktop.design/why_wont_my_radio_turn_ondxm5b.pdfIn PDF document text
    • http://youtube-subscribes.com/usana_prenatal_cellsentialsuvpoq.pdfIn PDF document text
    • http://helpcenter.business/2008_chevy_trailblazer_lt_owners_manualwc9pl.pdfIn PDF document text
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/dutomamilepone_keraze_zowowe.pdfIn PDF document text
    • http://harmony-market.ru/everything_at_once_lenka_sheet_musicr2bot.pdfIn PDF document text
    • http://comp-arenda.site/is_it_okay_to_eat_take_out_food_during_covid_19v1asg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428335/normal_5ffd27e8ae484.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/gigjhhg/observing_the_solar_system_quizlet.pdfIn PDF document text
    • http://nubolutlion.xyz/who_dies_in_avengers_endgame_comicpo8t8.pdfIn PDF document text
    • https://cdn.sqhk.co/madosodu/E2jeXhd/free_robux_hack_redeem_free_robux_codes.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/susuzafezamep.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/ZGjE2ji/electric_guitar_amp_for_sale_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/BhdIEQq/tap_tap_fish_abyssrium_pole.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saderure.rf.gd/fofogusosotomed.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_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 5408 bytes
SHA-256: f87c302abf8d26f1f8271f01a957149eaf9639a8ea9da1f93c411646b71560e9
font_01_sfnt_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 11004 bytes
SHA-256: 8fb7bbc6da80370dd5c27f16b6adf689ea073cfd8ef9165b536b2bc948a4ca11

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