Malicious PDF — malware analysis report

Static analysis result for SHA-256 21966ba73f03ddaf…

MALICIOUS

PDF

76.0 KB Created: 2021-04-03 08:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 116c1430b3de850eb5eeeb92f39610c9 SHA-1: 51058b309dbb33a6ccf3486bbe6ba7b68753cb9e SHA-256: 21966ba73f03ddaf1bed0252f2bc4f45bcb1ed08289b9f1cd88e32195f2160e1
252 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to appliance maintenance, designed to mask the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/strik?utm_term=how+do+you+defrost+your+samsung+ice+maker
    • http://rodina38.ru/suminubelimur29jtw.pdf
    • http://profaudit32.ru/kolilobujadexomusuwitoxer4e6.pdf
    • http://livemavuxedu.getenjoyment.net/cambodia_daily_news.pdf
    • http://kijofizovurisos.medianewsonline.com/63380223762.pdf
    • http://vengriya.space/boziwusepewowafov84pjm.pdf
    • http://berozabekep.sportsontheweb.net/cheikh_ahmadou_bamba.pdf
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/92f7df0d5.pdf
    • https://loxugajasogilo.weebly.com/uploads/1/3/4/4/134476701/banobugujig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jepinebawo/chellamae_tamil_songs.pdf
    • https://4fdc5cb1-0646-4ed0-9ac1-f9332ff2c333.filesusr.com/ugd/9b9480_2393022f989544a4920d88b771b4344a.pdf?index=true
    • https://3d1db4d0-c196-4dd3-8d5c-bb108cafbd43.filesusr.com/ugd/479e38_122a288a935b4497b55585853588b080.pdf?index=true
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_9589e4937a6b4fc78da491b5657ce983.pdf?index=true
    • https://s3.amazonaws.com/pezofut/52973626060.pdf
    • http://peregal.epizy.com/the_bamako_initiative.pdf
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_d3edc3d479d848bc80c3f3d37dd9eb4b.pdf?index=true
    • http://zifotefafometa.rf.gd/arjun_reddy_tamil_dubbed.pdf
    • https://s3.amazonaws.com/nijudow/neural_network_architecture.pdf
    • https://s3.amazonaws.com/kelageketisefuv/if_clause_type_0_1_2_worksheets.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_off0000eb05.bin
b43842855131cf02122f0aad3828b9aec8f3a844f4d5424275e6acfee63bae51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 5528 bytes
font_01_sfnt_off0000fdde.bin
59b0f63d3fbcc14b136660633c06dc3520c8c7c9c42b2b4cd477ad369e6cc6fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 10776 bytes

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