Malicious PDF — malware analysis report

Static analysis result for SHA-256 1480c4c0b51771b3…

MALICIOUS

PDF

80.2 KB Created: 2021-04-07 21:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1109ea3107b4eb1de3af414bca8397c7 SHA-1: 516bd730106a6d8e019ca9040201c04462b6bf13 SHA-256: 1480c4c0b51771b376c689f9f596c7e8f4e84ab234fb9591e61d7cedababf1a1
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external URIs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or redirection scheme. The primary malicious URL identified is https://dafemum.ru/strik, which is likely used to deliver a secondary payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dafemum.ru/strik?utm_term=what+are+the+methods+of+teaching+english+language
    • https://cdn-cms.f-static.net/uploads/4415081/normal_601237d57e0cd.pdf
    • https://cdn-cms.f-static.net/uploads/4424630/normal_603430e85e060.pdf
    • https://betoxugibujimiv.weebly.com/uploads/1/3/1/0/131071043/1a2d1b.pdf
    • http://dotenuvofatawe.iblogger.org/xabex.pdf
    • http://niwagiw.22web.org/bitigogivovezemovobam.pdf
    • http://losiruwu.66ghz.com/lezegopitinemos.pdf
    • https://patoduwewoz.weebly.com/uploads/1/3/1/4/131483118/2960956.pdf
    • https://cdn-cms.f-static.net/uploads/4374211/normal_6024cff3ec956.pdf
    • https://static.s123-cdn-static.com/uploads/4369638/normal_5febaddfbd339.pdf
    • https://bezatawe.weebly.com/uploads/1/3/0/9/130968967/3012c21f29c1.pdf
    • https://static.s123-cdn-static.com/uploads/4482207/normal_5fd052e38f3dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zexizel.epizy.com/how_fast_can_i_lose_5_pounds_of_fat.pdf
    • http://tavupikegoseri.epizy.com/47395953433.pdf
    • http://rejeremonuwiz.rf.gd/93133918193.pdf
    • http://zerozuru.epizy.com/the_trial_and_death_of_socrates_four_dialogues.pdf
    • https://48936d5e-4b15-4059-a328-ddb12afcc15e.filesusr.com/ugd/173145_71b7b0f2599e407094b3005074f2eae1.pdf?index=true
    • http://vibirokudod.myartsonline.com/a_decima_profecia_celestina.pdf
    • https://2eb5e741-fe40-4e13-9a70-20af0821b154.filesusr.com/ugd/6cf56c_adefd14fad3945c7a5719330d3aeadc0.pdf?index=true
    • http://tuwutexo.onlinewebshop.net/fenner_pin_bush_type_coupling_catalogue.pdf
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_85b5db2365ef47509c34f2bf46fcf543.pdf?index=true
    • http://validexa.epizy.com/zosepexe.pdf
    • http://jimifodapamusos.rf.gd/bid_evaluation_process.pdf
    • http://bomowufawifebi.rf.gd/verizon_wifi_router_yellow_light.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_off0000faae.bin
433100d1c3feed2625e5931c50751a6fc7c06b529eb2a3723430219937997fd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAE 5448 bytes
font_01_sfnt_off00010d19.bin
acb7bd2fe256d3005759bcb242c5434e11d3198ddad909cc0efe045b7a9459b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 10552 bytes

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