Malicious PDF — malware analysis report

Static analysis result for SHA-256 8493c4b397d2f3b6…

MALICIOUS

PDF

82.8 KB Created: 2021-03-20 13:27:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1a8fefc861ddc39aa02ee9f4de1034fd SHA-1: aee74d899d31862a0f769bb9fbad6462deee2c7b SHA-256: 8493c4b397d2f3b6bca4ba3e7d9875bf881ad35c6bb9789689376172d437bb0a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to malicious content. One such URI, 'https://golowaki.ru/strik?utm_term=starting+out+with+c%252B%252B+early+objects+9th+edition+programming+challenges+solutions', appears to be the primary lure, disguised as a programming book solution.

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://golowaki.ru/strik?utm_term=starting+out+with+c%252B%252B+early+objects+9th+edition+programming+challenges+solutions PDF link annotation
    • http://vikiduxa.mywebcommunity.org/redneck_manifesto_imdb.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/24310775027.pdfIn PDF document text
    • https://cdn.sqhk.co/palezubifo/g1AX8ja/war_of_worlds_2019_season_2.pdfIn PDF document text
    • http://mafaregasinuviv.22web.org/munugok.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/do_charcoal_drawings_sell.pdfIn PDF document text
    • https://cdn.sqhk.co/gobejilu/icgcjgf/97562687136.pdfIn PDF document text
    • https://cdn.sqhk.co/galuladoxaka/fMqlcic/2919733836.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/dubutukevezabumukomid.pdfIn PDF document text
    • https://cdn.sqhk.co/wezikinupig/jaLOrn5/kutir.pdfIn PDF document text
    • http://jisorozasakima.iblogger.org/whatsapp_free_mobile_app.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/vXkiijg/sirocco_definition_fr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_c75b4f826e974fbba0ee2c5cde4268c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/godewumazek/rodaganitozeninabo.pdfIn PDF document text
    • http://tevaninuwimo.epizy.com/97027253157.pdfIn PDF document text
    • http://nejarisiwudu.atwebpages.com/buku_peradilan_agama_di_indonesia.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/cara_video_streaming_uc_browser.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/40493052897.pdfIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_7e63474fa4eb42178f55836625290f3c.pdf?index=trueIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_06de78b8c6ed42049ffbcd8c7fcf1f0d.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_c7896bf6adfe4c67aec3d64fa86920e6.pdf?index=trueIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_a5da11034d4a4940a5da563f0139ff1a.pdf?index=trueIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_9cad11d112db46c0b54e875127f28d66.pdf?index=trueIn PDF document text
    • http://tenefotozefuzuw.rf.gd/67501511318.pdfIn PDF document text
    • http://vumazudu.rf.gd/jadubusixux.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_off00010068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10068 6156 bytes
SHA-256: 12037e5be4d9d12804353e32950f212f57b1a2c4610c31e38a3a3a5003615ad8
font_01_sfnt_off00011542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11542 11468 bytes
SHA-256: e7738720d98e1168afe35f110be6d512331ee76a6e8f17a2ac5f2af22dc67ef7

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