Malicious PDF — malware analysis report

Static analysis result for SHA-256 4721c40478820788…

MALICIOUS

PDF

73.5 KB Created: 2021-01-19 12:21:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 166e7d495e45edd2dfed6af221f3c76a SHA-1: 8618dd9e05904cba2c4c6b6d0de45bb67a5fedb9 SHA-256: 4721c40478820788e96f8b5945372cf2f2c7232915ca79da26937ff564efe5a1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is classified as malicious, containing multiple embedded links that point to known malicious redirector infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://yafferge.ru/123?utm_term=fake+report+card+creator as a malicious redirector. The document also exhibits characteristics of a link farm on disposable hosting, suggesting an attempt to distribute malicious content or phishing lures. No scripts were extracted from this sample, but the presence of malicious links is sufficient to indicate a phishing or redirection attack.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=fake+report+card+creator In PDF document text
    • https://komamizidunip.weebly.com/uploads/1/3/1/4/131437982/a6a948e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427785/normal_5fda175386636.pdfIn PDF document text
    • https://xonedapu.weebly.com/uploads/1/3/4/6/134654428/6828be5c263c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5fb94ca14610a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474720/normal_5fd14d85c7088.pdfIn PDF document text
    • https://cdn.sqhk.co/xekejegixawo/C8y8hhn/w3layouts_responsive_templates_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/Ohbhehh/wawaso.pdfIn PDF document text
    • http://pusedoropeseb.66ghz.com/informant_movie_bryan_cranston.pdfIn PDF document text
    • https://zogerosolubelu.weebly.com/uploads/1/3/4/5/134576434/94c7d0982f.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/hrZhhhe/hd_background_for_photoshop_cs3.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/a0ih6gd/beloluw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://babematalal.epizy.com/bollywood_all_actress_hd_wallpaper.pdfIn PDF document text
    • http://lodavudomajip.epizy.com/65076759487.pdfIn PDF document text
    • http://relimimukavewuj.rf.gd/accelerometer_working.pdfIn PDF document text
    • http://wanedinak.epizy.com/daluko.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_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 4876 bytes
SHA-256: 31bb0e3607568f380cde385744c302cdc0805358e1fdee3db096cd1012ce4336
font_01_sfnt_off0000f624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF624 10308 bytes
SHA-256: f4131d8967ab5edfa44384485b003a638c562a675108e950cc8d49bcb428c728

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