Malicious PDF — malware analysis report

Static analysis result for SHA-256 424c5c1fd5be9ab9…

MALICIOUS

PDF

67.9 KB Created: 2021-02-20 08:19:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8d477fa60fe7971d9473a9b738b2c2cf SHA-1: 22ad533c807b292d1dd44a3efb03340150c59a68 SHA-256: 424c5c1fd5be9ab90d78982f8072027cd278fbc0a3d7a073ed63aa1d9ab5df03
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://yafferge.ru/wix?keyword=lotto+black+book+pdf+free+download'. This indicates a phishing or scam attempt, likely to trick users into downloading further malicious content disguised as legitimate documents. The presence of numerous other PDF links, many hosted on S3 buckets, suggests a link farm used for SEO poisoning to drive traffic to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=lotto+black+book+pdf+free+download In PDF document text
    • https://pajejasebuwosiw.weebly.com/uploads/1/3/0/8/130813778/manirot.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/iaQSRhg/zimsec_history_paper_1_november_2018.pdfIn PDF document text
    • https://texexavif.weebly.com/uploads/1/3/1/4/131454683/415163.pdfIn PDF document text
    • https://vipomumukewa.weebly.com/uploads/1/3/0/8/130813786/9a8b1333dae.pdfIn PDF document text
    • https://depumubawaminuk.weebly.com/uploads/1/3/4/2/134236244/sezefujo-merevadidon.pdfIn PDF document text
    • https://jibisovewa.weebly.com/uploads/1/3/4/6/134653871/12fc254b.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/toniseligiwuzux/borg_mcenroe_subtitles_english.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/brocade_vdx_commands_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/bufegolawatuzetopusezaf.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/free_movies_hd_sites.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/rovukejokufutevixafosazox.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/linux_shell_scripting_tutorial_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/kumadufuvisuk.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/pogazoxidog.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_off0000ccc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC0 5208 bytes
SHA-256: 87d1b11ed9d3d75a3d9461a8e1ae22d177505b8c33140011590be31c3d0edf3b
font_01_sfnt_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 10636 bytes
SHA-256: bec67785878bb84779ce04660eab09ac73c31e77cb3633a368d851def40930db

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