Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a836327137bafe4…

MALICIOUS

PDF

86.7 KB Created: 2021-03-28 10:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a961e9694b79c5c0340bc204508c346 SHA-1: 5051813e72a0a4e291f1133ca60a2029fe2f7b92 SHA-256: 2a836327137bafe4d439e14e41ad9099d3679f81baf2e90258f80b98f4b5c496
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', with one prominent malicious URL being fokemale.ru. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/123?utm_term=lidl+ni+offer+sheet
    • http://digitalmedialit.com/coc_clash_of_magic_mod_apk03jw3.pdf
    • http://atomyimperial.ru/agneepath_full_movie_2012_hd_480p8o6z6.pdf
    • http://dress-russia.ru/r_kubica_newsdfqix.pdf
    • http://alkim.xyz/dikuzaxefizusemutboqig.pdf
    • http://arthromedro.xyz/46658287911cfzfz.pdf
    • http://snail-case.store/mental_toughness_in_sportvsu62.pdf
    • http://marketitaly.info/finakaloy0ql9.pdf
    • http://biwejobezimije.22web.org/1874979788.pdf
    • http://erogancolumbia.site/alimentos_y_bebidas_con_0_caloraswq9r4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kotidox/pofibukex.pdf
    • https://s3.amazonaws.com/datarofapakil/lalorovewofefokewapaxob.pdf
    • https://68f06c25-eb64-4e0a-94e3-a0e33e610147.filesusr.com/ugd/463ace_5d48ae268e2c45a0be92d57d4ef43fc9.pdf?index=true
    • http://winixugerefubu.epizy.com/what_do_you_mean_by_zone_of_proximal_development.pdf
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_53f1a35ffe264c6cb3a50cd1f0a1fa5e.pdf?index=true
    • https://s3.amazonaws.com/moduxanakuri/npa_malaria_prophylaxis_guidelines_2019.pdf
    • http://xafegewoweli.epizy.com/get_class_stylesheet.pdf
    • https://s3.amazonaws.com/wukara/27311404173.pdf
    • https://de74b992-0de1-402f-a2cc-438209b178b2.filesusr.com/ugd/2693ef_53d249a759af494e8609e0dc55aadbae.pdf?index=true
    • https://s3.amazonaws.com/gasodamuza/86527637916.pdf
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_c69e06242c5c40dc99d137ff870e1c23.pdf?index=true
    • https://s3.amazonaws.com/bulolimepol/80243417253.pdf
    • https://s3.amazonaws.com/xalexojaxipud/bosoresare.pdf
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_2691eca36adf478282718bf097192bea.pdf?index=true
    • 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_off00010f02.bin
f9b121399bd0bb85dd02e9d9ab178b482e1b82f4efda270a1e51c392e11f4d8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F02 4728 bytes
font_01_sfnt_off00011f13.bin
77a4d359a8ce96a6b1700a015940bf77f511aefcda2bd37640ac4b6c2bb49e31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 14360 bytes

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