Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84216a40138940d…

MALICIOUS

PDF

78.8 KB Created: 2021-03-11 08:57:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f1041f3b3d7f15dbe78d0784bfbcaa9f SHA-1: 39db66ded1e6598f7073af669b3b4cb615bea360 SHA-256: d84216a40138940de2bbedfca60af16f4beddb4baa0defeaad7899dbca9ee1e6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver malicious content.

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://kuzutuzo.ru/wix?keyword=the+outsiders+chapter+2+and+3+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/lagolipumepi/XMGZvhh/achilles_tendon_anatomy.pdfIn PDF document text
    • http://xtreme-sport.ru/chiranjeevi_rakshasudu_songsd5bs6.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/oid19jf/lokefuvan.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/hidDxia/lubedijetozexapuwokidojad.pdfIn PDF document text
    • http://agreevudb.rest/shiv_tandav_mantraz6fpk.pdfIn PDF document text
    • http://uber-global.com/71079874863m95co.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/LS4jdjd/vr_games_coming_2020.pdfIn PDF document text
    • http://topstudy.fun/rodotuzezek9bpr.pdfIn PDF document text
    • https://cdn.sqhk.co/fakomuse/5jaohga/3964610407.pdfIn PDF document text
    • https://cdn.sqhk.co/delotijuw/2MRhboJ/6929344418.pdfIn PDF document text
    • http://arevakar-travel.com/146309777678c05y.pdfIn PDF document text
    • http://kiritisivasol.mywebcommunity.org/notuweletinukejof.pdfIn PDF document text
    • http://kofodotig.sportsontheweb.net/99362269405.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/Uhgjehd/wowuxunamavotu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/firudegix/tv_guide_perth_wa_the_fix.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/c_function_reference_pointer.pdfIn PDF document text
    • http://tosurok.myartsonline.com/xuzazawesasajelo.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/what_is_the_best_toaster_air_fryer_oven.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/42794681193.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/bepipepefadikuxutezoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e737450-1aa7-45a5-b9e0-f8bdff500ced/8145857182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0243d9e-7e19-4cee-bb98-7e05bb9c9408/lijun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22ecd3d1-3fe7-44a5-9a07-15a5b47fccca/72610158797.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 5476 bytes
SHA-256: 06761397a8e221b28d66dc48430d1944f9a77bdabf800fc4baa3589382973f1c
font_01_sfnt_off0000fbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCD 10380 bytes
SHA-256: 79537c1d5e60f9cc7dca689ce04bed1d7fa0701a759a02458a224805c55b2c4c
font_02_sfnt_off00011f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F47 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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