Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a471d85a96ec0da…

MALICIOUS

PDF

78.8 KB Created: 2021-03-16 13:20:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0a2ddcc1b2392227c245c76bc770758e SHA-1: b12b7d49c984a6aff118542538c4c8027682d546 SHA-256: 1a471d85a96ec0da8399f1f8f5eb2af6f6ee15723cf68d8e36208b9541ba0993
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The presence of numerous links to disposable domains and link farms suggests a phishing or spamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/award?keyword=differential+and+integral+calculus+notes+pdf PDF link annotation
    • https://cdn.sqhk.co/bibikodazit/tjbfjjP/majukevosamego.pdfIn PDF document text
    • http://vizenam.medianewsonline.com/examples_of_critical_thinking_in_nursing_school.pdfIn PDF document text
    • https://cdn.sqhk.co/dufolatik/jfOWBPE/piggy_wiggy_nuts_game.pdfIn PDF document text
    • http://wodekenizowa.getenjoyment.net/lupewi.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/iidl7ie/thank_you_coming_my_birthday_party_speech.pdfIn PDF document text
    • https://cdn.sqhk.co/rolidazi/jgxVieu/91146826241.pdfIn PDF document text
    • https://cdn.sqhk.co/joremeve/geOljij/microsoft_azure_training_day_fundamentals_london.pdfIn PDF document text
    • http://lonotel.mygamesonline.org/26125968676.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/diagnostico_cancer_de_prostata.pdfIn PDF document text
    • http://raraveluwogevuw.mypressonline.com/68051286912.pdfIn PDF document text
    • https://cdn.sqhk.co/safubuguva/iaePwpm/switzerland_covid_restrictions_france.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/kifgd6a/16920639545.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/how_to_install_foxit_reader_printer.pdfIn PDF document text
    • https://cdn.sqhk.co/texivewa/hahbjaO/72306207746.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/jggfRje/bendy_song_free.pdfIn PDF document text
    • https://cdn.sqhk.co/mopijiluxu/yhaheHt/95064799872.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bagisi/how_to_identify_asbestos_vinyl_sheet_flooring.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/australian_tv_guide_cairns.pdfIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_dffb4fcc20b44f4b973c06b96f7423a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/96342463029.pdfIn PDF document text
    • http://rosevasejila.myartsonline.com/gathering_storm_civ_6_new_leaders.pdfIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_0e1f44495e7c4dec8e42cc9608c03e59.pdf?index=trueIn PDF document text
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_8483f3f4a9c044b780a66d7f70a0a4cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pigolo/edgar_allan_poe_free.pdfIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_ec5eb4c10a714dc0abc8c89fc809743b.pdf?index=trueIn 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_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 5320 bytes
SHA-256: a9839959d41fb26fcce3eea14f68cf27d2bb48afac88bcf7278399d28ba83e8f
font_01_sfnt_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 10696 bytes
SHA-256: d522b5d395ed460c29841c475d65139c555ec01a7126c7d9243aebe3d88b18e0