Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cddc9e988e624bd…

MALICIOUS

PDF

74.2 KB Created: 2021-04-19 08:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09a43a37914610af6152831194caa6a1 SHA-1: da5a10aae6b98ccfa261e075a7fe436062965999 SHA-256: 3cddc9e988e624bdeb77195581d822f75f43df6b8dc3f238c39c45ef302c6111
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating a link farm or redirection scheme, a common tactic for phishing or SEO spam. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and extensive external URLs point towards a malicious document designed to lead users to harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=audit+manager+interview+questions+and+answers+pdf
    • http://wavewozokuxa.getenjoyment.net/rixupodufuxekuva.pdf
    • https://bisigategisabuv.weebly.com/uploads/1/3/4/8/134884720/xaxokagig.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • https://cdn.sqhk.co/rekubapapup/hITjNXr/the_child_of_slendrina_mod_menu.pdf
    • https://xakediripikevul.weebly.com/uploads/1/3/4/3/134338645/tiduwefekun_nedumobemelu_ruvilonofe.pdf
    • https://mivoxoxez.weebly.com/uploads/1/3/4/3/134340481/ced40.pdf
    • https://cdn.sqhk.co/simixejazir/3xggsic/jegupenufej.pdf
    • https://cdn.sqhk.co/nowavutu/b3oK1oY/95426993612.pdf
    • https://fotelosalif.weebly.com/uploads/1/3/4/4/134463398/vevupisirup.pdf
    • https://cdn.sqhk.co/wemonamo/aWibLZz/art_sculptures_for_wall.pdf
    • https://ramoxibe.weebly.com/uploads/1/3/1/6/131636726/lubirudijajonup.pdf
    • https://tonewebebajuja.weebly.com/uploads/1/3/5/3/135319275/wivile_kogesip.pdf
    • http://oneitstore.pro/starbucks_barista_training_videosnnlxf.pdf
    • http://allerlo.xyz/avatar_3d_game_for_android0tqk4.pdf
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/9a5f8be9e06d874.pdf
    • http://sugameloxufe.mywebcommunity.org/accu-chek_fastclix_102_lancets.pdf
    • https://cdn.sqhk.co/ninoporaleva/iQAY7ii/pujotadukelaga.pdf
    • http://xofofumireke.mypressonline.com/29783541574.pdf
    • https://xixemoxutosiseg.weebly.com/uploads/1/3/4/4/134473276/kowavapezibit.pdf
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/nafepiwoj.pdf
    • http://bagutoruramig.mywebcommunity.org/28303967545.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fukuselumetu.myartsonline.com/rasejis.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_off0000e5a4.bin
85b9e6e090ec19cdfc863ee8c1a4d9ab87b687f83fbbd0eaccb73c322823c3f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A4 5596 bytes
font_01_sfnt_off0000f8a4.bin
c0b6e2a8372a959d40600ced39fc83b825520e1168d655d7239a0a19affbbe6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A4 10500 bytes

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