Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ada74b93aa675d…

MALICIOUS

PDF

78.5 KB Created: 2021-04-11 07:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7fa9acc8329045087d4db34a7a7ff93 SHA-1: 9757b24c50f1d2a38838021e424f4a5192837912 SHA-256: 82ada74b93aa675db203311ab7bf8b27c8a041a89f867a91490c4a0e06b399ed
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=what+happens+if+you+get+dmso+on+your+skin
    • https://cdn.sqhk.co/liwifetil/iijjchh/runcorn_expressway_toll_payment.pdf
    • https://cdn.sqhk.co/rukeditele/igghKsU/xuzuburevej.pdf
    • https://cdn.sqhk.co/kukabelek/Zx5Jgik/amusement_arcade_3d_apk.pdf
    • https://cdn.sqhk.co/dekavaka/hgr5ihP/55906228014.pdf
    • https://vatipasa.weebly.com/uploads/1/3/0/7/130775610/1be66ed.pdf
    • https://cdn.sqhk.co/nejibija/EjfuOX8/christmas_wonderland_9_hidden_object_game.pdf
    • https://xapidusexinixov.weebly.com/uploads/1/3/1/3/131382907/tomezukexewebekalo.pdf
    • https://wuneregogituweg.weebly.com/uploads/1/3/4/6/134686440/2030924.pdf
    • http://pobuzajabazuwu.iblogger.org/bhola_bhandari_kare_nandi_ki_sawari.pdf
    • http://webcam-model.online/what_is_heightened_sense_of_touch2wc04.pdf
    • http://xruhdfo.site/4352149826642wvq.pdf
    • https://cdn.sqhk.co/suwezuzifu/bgjhjia/number_counting_activities_for_toddlers.pdf
    • https://cdn.sqhk.co/zupodejadofe/gdbwSia/pressure_washer_surface_cleaner_attachment_harbor_freight.pdf
    • https://cdn.sqhk.co/nuleneru/BOChhgy/21832031090.pdf
    • http://donbetosstreettacos.com/famaduwaboku3t1j.pdf
    • https://cdn.sqhk.co/pejozujemu/zPeJgfn/class_10_maths_coordinate_geometry.pdf
    • http://polixomun.22web.org/23125568156.pdf
    • https://cdn.sqhk.co/luwukamuku/Jhdjjhc/forikobosef.pdf
    • http://kawotasurigexa.iblogger.org/243720167.pdf
    • http://wonder-ita.fun/lelirotefatofifoxugobop1e3il.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://natikajurijufuk.rf.gd/fire_and_blood_book.pdf
    • http://gokosipok.rf.gd/mopadafiwumosurusopajazo.pdf
    • 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_off0000f48a.bin
e716976d111802ade6ed0efd5e639256f622b8c2efbd585d6fe768b1dba1fc1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 5600 bytes
font_01_sfnt_off00010783.bin
788bdd0709e999e4432152d6d1ef2ad03682780f75aa2c75014fcc2d1e553ddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 11052 bytes

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