Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4b863161fdbd5d…

MALICIOUS

PDF

75.1 KB Created: 2021-02-18 10:26:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2b76757ceeedc53f787dcbb44fd9f4f2 SHA-1: a092a6addbcf7017c871c643b0b84922e2e0704e SHA-256: 4d4b863161fdbd5d395d54b56a15e0635e8c5a77d19313ad16309425a8419397
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a phishing or malware distribution scheme. The embedded URL 'https://bologen.ru/strik?utm_term=dewalt+dw718-xe+manual' is likely part of this redirection chain, aiming to trick users into downloading a payload or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=dewalt+dw718-xe+manual PDF link annotation
    • https://sufojise.weebly.com/uploads/1/3/0/7/130739234/kusikilasobuk-fuwir-gowiwosukija-nowagatanulimaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_5fe9b7c738465.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456699/normal_5fedc96281f6d.pdfIn PDF document text
    • http://klyshsheff.xyz/75133987011dcpq6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_6023398f7d3de.pdfIn PDF document text
    • http://repair-monokoles.ru/sad_shayari_video_song3blho.pdfIn PDF document text
    • http://bred-enligne.com/nejaverekofefomubippxiec.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/gudobelamurekesl6py.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378831/normal_5fe2ed439244d.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/bizamesuwepe/zasave.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/briggs_and_stratton_spare_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/english_grammar_lessons_video.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/bharat_ane_nenu_movie_bangla_subtitle.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/microbiology_antibiotics_lab_report.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_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 5216 bytes
SHA-256: 5dba441f4b204bb12fc04c3cae47dfcc0c07dcf533b7cb282cf138720e44da43
font_01_sfnt_off0000faba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABA 11536 bytes
SHA-256: 6343d8f0fe92f0821f41fdb74d626fbf31767b3b5895c537b2d542b0adc67879