Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e08b3cdad9523c…

MALICIOUS

PDF

70.5 KB Created: 2021-02-27 16:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3b1c09e94d1bd4651a0132ce78c50950 SHA-1: c943fb1c725482dafb7d5705b056fdae44dd23cf SHA-256: 91e08b3cdad9523c74a8afb804f85e1772cb1ac30725c9d3012dc2290982d98b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO poisoning attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though partially corrupted, suggests a lure related to a 'Toro wheel horse parts manual', aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=toro+wheel+horse+416-8+parts+manual PDF link annotation
    • https://cdn.sqhk.co/jopuromug/N2jjgeu/fasubipexixapo.pdfIn PDF document text
    • http://tehnikator.ru/fan-tastic_vent_model_1250b5c6k.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/Sbidhbt/voicemeeter_banana_mac.pdfIn PDF document text
    • https://nozinogut.weebly.com/uploads/1/3/1/1/131164424/df9642514c35.pdfIn PDF document text
    • http://esclub.info/covalent_bonding_worksheet_docliaxx.pdfIn PDF document text
    • https://dukazegisow.weebly.com/uploads/1/3/0/7/130740117/6327894.pdfIn PDF document text
    • https://puvawimorewafiz.weebly.com/uploads/1/3/5/3/135383948/5788867.pdfIn PDF document text
    • http://pixxel.life/wimubakifstrah.pdfIn PDF document text
    • http://nokewobepasag.22web.org/what_was_the_significance_of_the_mayflower_compact_quizlet.pdfIn PDF document text
    • https://zetejuxir.weebly.com/uploads/1/3/4/3/134338478/4529124.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/d2m6scT/the_adventures_of_tintin_2011_ok._ru.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/6951195.pdfIn PDF document text
    • https://cdn.sqhk.co/dodazija/ehjnrji/who_has_the_most_buzzer_beater_game_winners.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/fbjao5w/bus_simulator_ultimate_online_nas_l_oynan_r.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/aqVjjig/21496742951.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/how_to_empty_dyson_dc59.pdfIn PDF document text
    • http://keep-travel.com/sozawufefipeburlgbs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tedusulowo.rf.gd/causative_have_get.pdfIn PDF document text
    • http://fozajekipijijax.epizy.com/14430746500.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_off0000d684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 5620 bytes
SHA-256: 6733b911798d040ce030f1452e82a46cf956a87e6a4c96ebfe125d103f77d389
font_01_sfnt_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 10332 bytes
SHA-256: 24c988c4927e16c56bac62b1df26460c3f5ecdee847c4b22021cbb0ee4eee513

Open this report in the interactive analyzer, or submit your own file for analysis.