Malicious PDF — malware analysis report

Static analysis result for SHA-256 73881cdf033ba904…

MALICIOUS

PDF

87.3 KB Created: 2021-04-06 20:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0816893b72283c412ab99f7b68b8c486 SHA-1: 377e5197a14f24ae0e1352d13b6a1534cec53cab SHA-256: 73881cdf033ba904af4cad0666f0121334f97d3c0863742408ecd5b795767299
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on redirecting the user to a URL that appears to be a search result for 'public speaking definition terms'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://gimoguvi.ru/strik?utm_term=public+speaking+definition+terms
    • https://cdn.sqhk.co/rinugezig/hgfOhdV/kodomajifizo.pdf
    • https://bazulerijodinib.weebly.com/uploads/1/3/1/8/131856415/994dcdfb4a8df.pdf
    • https://mosodujisar.weebly.com/uploads/1/3/0/7/130739504/dafev-kakumazok-tewaluwikugu.pdf
    • https://cdn.sqhk.co/kivipemo/hhjdhid/43068504625.pdf
    • http://sijubuwejipamun.mywebcommunity.org/dreams_from_my_father_barack_obama_download.pdf
    • https://nasorigabewa.weebly.com/uploads/1/3/4/5/134519214/jonosedi-toxasijimi-pebovatikomix-rudoged.pdf
    • https://nevozijefase.weebly.com/uploads/1/3/4/7/134748823/7208505.pdf
    • http://bajuzupur.22web.org/zumedifokizuxududevuv.pdf
    • http://pusulij.22web.org/amended_1120s_tax_return_form.pdf
    • https://cdn.sqhk.co/noviraxat/kVgcicG/wonelaxovepivu.pdf
    • https://cdn.sqhk.co/numiwuzuwix/B7id4hd/38353170759.pdf
    • https://cdn.sqhk.co/libarazituw/iciegiu/daily_forklift_inspection_checklist_form.pdf
    • http://duwuzoruperiged.scienceontheweb.net/family_camping_checklist.pdf
    • https://kimewazokedusa.weebly.com/uploads/1/3/1/4/131454536/luvedile.pdf
    • http://vapurese.22web.org/58176625753.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tovajukoxeboder.epizy.com/plant_ecology_and_phytogeography.pdf
    • http://mejufupivu.epizy.com/67270834270.pdf
    • https://uploads.strikinglycdn.com/files/b5327f61-d963-4ad7-8bd0-636c2fcf4b79/jomimuguga.pdf
    • http://worupowa.epizy.com/74143095634.pdf
    • https://uploads.strikinglycdn.com/files/9a87ad80-eb90-42db-982e-351d293e9a6d/what_is_a_therapeutic_foster_home.pdf
    • http://liruvumud.rf.gd/4054294147.pdf
    • http://ragudoduwe.epizy.com/waxiriwuneputirodoz.pdf
    • https://uploads.strikinglycdn.com/files/97dbe42e-ca87-4acb-b6df-68d60d197777/gigavesum.pdf
    • https://uploads.strikinglycdn.com/files/b2468827-0712-485d-8681-67c9b2332f3e/artificial_neural_network_python_sklearn.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010be1.bin
56c3637034010a30d9a21a2eea10074b5c65d5ead234be80fe8da1049fdad687		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 5560 bytes
font_01_sfnt_off00011ea3.bin
fb8d3cc02df0fdfce5143906bf8d33fd8a8ff2f1a15e1f156e85cdae7331a085		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA3 10096 bytes
font_02_sfnt_off0001413c.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1413C 4324 bytes

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