Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57decc37200a55e…

MALICIOUS

PDF

82.2 KB Created: 2021-03-25 12:13:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 440cfa0da7ce21591bdfa55707e474d9 SHA-1: c39fff19d5f42cdfd392b903767b40e5a6fbf771 SHA-256: b57decc37200a55e266484ccd0ddebf7ca5ff5c1fc67234eab86e9614ccadd34
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=what+is+rawls+theory+of+justice+class+11
    • https://cdn.sqhk.co/xewafazuk/z0jhDha/mods_for_minecraft_pe_1._12._0.pdf
    • https://cdn.sqhk.co/tunuviju/idhj0jb/draw_blood_in_asl.pdf
    • https://fopudodesesiwen.weebly.com/uploads/1/3/4/3/134344932/delodezata.pdf
    • http://allroadkamchatka.ru/nkjv_study_bible_amazon0pv3w.pdf
    • https://cdn-cms.f-static.net/uploads/4484821/normal_60348031343e0.pdf
    • https://cdn-cms.f-static.net/uploads/4402504/normal_6048a01a32e83.pdf
    • https://cdn.sqhk.co/ledodatefu/hfiejeI/53667740096.pdf
    • http://onlinetiser.website/zenwise_digestive_enzymes_walmartpwl9r.pdf
    • http://gaxopuxa.iblogger.org/reasons_why_school_uniforms_should_be_banned.pdf
    • http://cherrypimp.online/528720753706bpqh.pdf
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/jojumidogez_nilidosezixetok_finob_zapowelomir.pdf
    • https://xutawolovunoka.weebly.com/uploads/1/3/0/7/130739399/vomob.pdf
    • https://cdn-cms.f-static.net/uploads/4415321/normal_60146ee736a29.pdf
    • http://mazanatur.space/kinekepowedejebe20ypt.pdf
    • https://static.s123-cdn-static.com/uploads/4491157/normal_5ff249087f531.pdf
    • https://cdn.sqhk.co/mafowixodi/b6BqghM/final_fantasy_7_remake_ps5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://savikolapuxol.rf.gd/eicar_test_string_attempt.pdf
    • https://uploads.strikinglycdn.com/files/0216ce61-6149-44d2-8728-3f580697c8e5/dewalt_dwe7480_table_saw_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/b5e2f94b-e145-4e39-a061-87ba6c688bbb/rujafixiruxapifuzopep.pdf
    • https://uploads.strikinglycdn.com/files/7603ab24-066d-486f-8aa3-d2b392d4f9f9/how_to_reset_samsung_network_extender.pdf
    • https://uploads.strikinglycdn.com/files/9babaa7f-5c1c-4651-a10b-6aa738e11c8b/77853483938.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7f.bin
91b849b72ca78f1367cbb09a62fd88a3f756832c261428988bd72f01dd60b829		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 5304 bytes
font_01_sfnt_off0000ffa6.bin
63378112e98ca0271f499418909c360442ff550bc7695f1603f37be04372f2b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA6 10732 bytes
font_02_sfnt_off0001248d.bin
b81bd6dad15da1d34caef1519340d18a34796ec70328335d7cf798cc40c487ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1248D 16096 bytes

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