Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aebc2874e1ef916…

MALICIOUS

PDF

78.5 KB Created: 2021-03-02 00:34:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 13408587514427eea5a07c87eed66540 SHA-1: ee8af47689b6300a8dde8b9657b3dce3c313edb8 SHA-256: 4aebc2874e1ef9167761d739bbbd1a362bc130a917006c01b6c171f4cd8a15a3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one prominent URL pointing to 'zajinet.ru/strik', suggesting it's designed to redirect users to a malicious site. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its generation method and potential use as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=into+the+darkest+day+book PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459057/normal_5ff2720662faa.pdfIn PDF document text
    • http://all-system7.xyz/rheem_quick_recovery_gas_indoor_water_heater_pilot_lightrhik9.pdfIn PDF document text
    • http://novonet.online/842685162557tz17.pdfIn PDF document text
    • http://fabulouss.space/assamese_poem_nostalgial1tuv.pdfIn PDF document text
    • http://helpcreditscore.info/bersa_thunder_380_plus_kydex_holsterjslsv.pdfIn PDF document text
    • http://kebenoda.scienceontheweb.net/tuzobuwamuzilobuvakewufer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461777/normal_5ff7be1b6b5ba.pdfIn PDF document text
    • https://zabodoxukuxubar.weebly.com/uploads/1/3/4/9/134904472/pipodariledebawokoki.pdfIn PDF document text
    • http://fbdirect.site/98375479424h6lo0.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/bajulipajumugo.pdfIn PDF document text
    • https://kamowomol.weebly.com/uploads/1/3/4/3/134371521/gugedifadoxi-buposenageb-xadaluso-dituj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rajamuviw.epizy.com/71053401359.pdfIn PDF document text
    • http://nobubuti.rf.gd/google_sheets_vlookup_multiple_columns.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 5124 bytes
SHA-256: 3cbc03e60b0340350cdb49b672c68a37654095072a400da8f966d3cf490f1f2c
font_01_sfnt_off00010a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 10180 bytes
SHA-256: 91494d750cdde0412bbe87d9ad7c14a89e58c8a6dc637bafdab2622f74dc0f24

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