Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad09281151bb8218…

MALICIOUS

PDF

79.9 KB Created: 2021-04-24 17:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b059c6e4b44f23c8d18ea114474d3ee SHA-1: 662badb999ce9f2ef37117166a63b43523c5fadb SHA-256: ad09281151bb8218f7ded4e26231c6f35849eeab3447fba388c7c11905d3bcd2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to obscure the ultimate destination. One prominent URL, 'https://maypoin.ru/strik?utm_term=dell+ultra+hd+4k+monitor+p2415q', is presented in a way that suggests a lure for a product, likely leading to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://maypoin.ru/strik?utm_term=dell+ultra+hd+4k+monitor+p2415q
    • https://cdn.sqhk.co/womafafowix/50Avjdk/marketing_strategy_journal_2015.pdf
    • http://nevinidonet.mywebcommunity.org/56224765212.pdf
    • http://wotukujis.sportsontheweb.net/navien_npe-180a_spec_sheet.pdf
    • https://cdn.sqhk.co/kerutadit/ahhVVic/smart_wifi_3_way_switch_mss550.pdf
    • https://mogarujatokeduw.weebly.com/uploads/1/3/5/3/135324664/2000751.pdf
    • https://buxiwizekekaxe.weebly.com/uploads/1/3/4/6/134662233/7869140.pdf
    • http://fukerijinexin.mygamesonline.org/polaris_scrambler_400_2_stroke_hp.pdf
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/sojazezodofi-domadexi.pdf
    • http://tazanup.mypressonline.com/simple_weekly_budget_worksheet.pdf
    • http://jolidulikan.scienceontheweb.net/66335471351.pdf
    • https://cdn.sqhk.co/medujebukoma/icheial/31031990687.pdf
    • https://tojumemi.weebly.com/uploads/1/3/1/3/131379390/midisaju-purikezo-lonafula.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/72ff9c40-f7b1-4be6-a5a0-5c7702775e18/primordial_god_of_greek_mythology_crossword_clue.pdf
    • https://uploads.strikinglycdn.com/files/53bb72ae-79ad-46eb-8b39-abbfdf41c6d5/can_you_treat_dog_mange_at_home.pdf
    • http://tevaluzax.atwebpages.com/blastocystis_hominis_tratamiento_en_nios.pdf
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_877ae37e1faa41edb2e7657dde515d1c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5b483171-5e3b-46af-b4d8-f51d3e2cf5b7/budemodupuj.pdf
    • https://eb9d0a7c-f241-4274-9260-18def620c3fd.filesusr.com/ugd/796b85_f4512b06afd64f358f8e93acc6561493.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb60.bin
bea9a0366f2909ab09b6d53cf4c442d661c2869d8ce87e281bce343e642ed8f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 5604 bytes
font_01_sfnt_off0000fe53.bin
1574ea18d46c3226719e2e5fc0e1a1e981affa8cc8f5814f4365fabb07746db3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 21060 bytes

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