Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e0b0227f4bc861b…

MALICIOUS

PDF

90.5 KB Created: 2021-04-05 16:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c6d47dd4771b1ecbf5aa4cac2bbc8aaf SHA-1: d6e78cd799d52e01c454b77fbd33ae621bbbd442 SHA-256: 0e0b0227f4bc861b9b9d911464f566e6982ec7306d930f48e01a59d3ad96f1c6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://pelibifir.ru/strik?utm_term=how+to+write+taylor+series+expansion', is suspicious and likely leads to a phishing or malware distribution site. The ClamAV detection and ML classifier further indicate malicious intent, suggesting the document is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://pelibifir.ru/strik?utm_term=how+to+write+taylor+series+expansion PDF link annotation
    • https://rurevudo.weebly.com/uploads/1/3/4/2/134265418/00e99441c29b.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/dhhlUhT/vapogadujodudogir.pdfIn PDF document text
    • https://safamitiwifiro.weebly.com/uploads/1/3/0/7/130739579/xusisigada_nibizusuzebude.pdfIn PDF document text
    • http://onkoprofi.ru/wupodabopotelesavelarui.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/c4c09jc/soliwiputifo.pdfIn PDF document text
    • http://smartcreditcheck.info/wenejafebagi8e519.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fogaduvese.epizy.com/medodizojuma.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/76998408963.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/lurawotovafi.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/how_to_use_stanley_40_amp_battery_charger.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_436cc2aa173444cabd1d26bce55cf826.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/xapufipazenokuk.pdfIn PDF document text
    • https://bb209e34-24c3-4901-88bd-c00af8cda710.filesusr.com/ugd/de6798_54c31dfe27f64127abcd7e782c3148b7.pdf?index=trueIn PDF document text
    • http://xutunebel.epizy.com/88619636939.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/horse_pumpkin_template.pdfIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_aa007bc1c79140a6b154c0b9be3ec555.pdf?index=trueIn PDF document text
    • http://madojizekikozor.epizy.com/68097268307.pdfIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_b57808a62c174ab6b7a60398dbb724a1.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 5036 bytes
SHA-256: bd63bf1d8fa7c0133ee69a7ba3bb575045cb71f2feacbdbb8c7ede48bfea6ede
font_01_sfnt_off00011d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D89 12528 bytes
SHA-256: 95cf4c30379d185bd09e1a80647add00e683c2fa785bf77b2f0f497bcd124070
font_02_sfnt_off000147e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E4 16088 bytes
SHA-256: 9753be895d245cd19b91d2bb005486a7315a2c059f8c46e693cdd4b010f2005c

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