Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e4e018b1021cd1…

MALICIOUS

PDF

74.7 KB Created: 2021-02-27 23:57:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 23e4de4c6136cfc681b77f11fc7f86f1 SHA-1: 28f3b9817248b15764232e576f99fceffe623dcb SHA-256: d6e4e018b1021cd1becc41bebf1e7abb02e0414afb40bf56d398b1736c69eab0
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs and a suspicious domain 'jumiwimov.ru', indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jumiwimov.ru/wix?keyword=how+to+program+2014+jeep+key+fob PDF link annotation
    • https://bezowaki.weebly.com/uploads/1/3/4/6/134611163/misixukirafonur-devawiseditedo-duferozovaj.pdfIn PDF document text
    • http://reduslimitalia-official.website/34860757185652ax.pdfIn PDF document text
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/begenezu.pdfIn PDF document text
    • https://fijozemubo.weebly.com/uploads/1/3/4/2/134234573/tuwiti.pdfIn PDF document text
    • https://rupogasonewu.weebly.com/uploads/1/3/4/6/134653860/sorejogitidipol_tovinoporivepe_foral_natezeb.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/gufowarixanivasilalibukjk58h.pdfIn PDF document text
    • http://kinoxca.xyz/77714546635g6pkh.pdfIn PDF document text
    • http://scrlt.xyz/biroxenapigowa7t79s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/suxiweke/runescape_07_barbarian_assault_defender_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/10613575145.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/business_environment_class_12_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/97912306167.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/95221264836.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/16795426523.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/affirmative_informal_commands_spanish_verbs.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_off0000e70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70D 5860 bytes
SHA-256: 20aeade122a1e95d387bb47e279d48785ea29192f5e055037ed6a8bfd5eeb502
font_01_sfnt_off0000fb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 10220 bytes
SHA-256: 3c2897b26537e2ee310af90c795e3d1467d0e425185abecbf19aec647f8aab72

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