Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a56c7f5264f58ea…

MALICIOUS

PDF

73.9 KB Created: 2021-02-19 04:50:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d0ee379fe260b9e27e0e08a9fc8ef111 SHA-1: 01803ff3dde9a7552f861529b63e945c7da39882 SHA-256: 4a56c7f5264f58ea0882aeb9cc7b49a6835b748b33d78748c41871685cb3c98a
184 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/123?utm_term=where+are+all+the+journals+in+sea+of+thieves+maiden+voyage'. This indicates the document's primary purpose is to lure the user to this malicious site. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

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=where+are+all+the+journals+in+sea+of+thieves+maiden+voyage In PDF document text
    • http://piwakere.iblogger.org/other_word_forms_for_guise.pdfIn PDF document text
    • https://vudaxevagi.weebly.com/uploads/1/3/4/2/134234865/5234734.pdfIn PDF document text
    • http://wilozobugo.iblogger.org/fadutisarurolozafogepilum.pdfIn PDF document text
    • http://mikiduvedopavu.22web.org/odometer_discrepancy_form_tn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422918/normal_600a11cb5a6f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460688/normal_6021115e6142d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403418/normal_5fe07d67e0c8c.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/xurixado/look_up_child_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/nofokolowevak.pdfIn PDF document text
    • http://kagokonutuvep.epizy.com/lazumatir.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/mitodakewiros.pdfIn PDF document text
    • http://pekotezubefem.rf.gd/jethro_tull_bouree_sheet_music_bass.pdfIn PDF document text
    • http://wogafut.rf.gd/gainful_employment_disclosure_template_2019.pdfIn PDF document text
    • http://nomijedelalevi.rf.gd/feneguvixudow.pdfIn PDF document text
    • http://kotutuvotijol.rf.gd/zujizov.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/tasuvojakajuzokedu.pdfIn PDF document text
    • http://kasisag.epizy.com/transformation_of_chemical_energy_to_electrical_energy.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/ppsspp_emulator_for_pc_32_bit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85A 5572 bytes
SHA-256: 19a98af800f062e6c12f19f0fdba0512208ce9bc571e04ae3ff16c631c6eb3e4
font_01_sfnt_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 2992 bytes
SHA-256: 4a95cd8baef931096401c1afb6085dc70b28cf5844811540140a3a46478ca844
font_02_sfnt_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 9792 bytes
SHA-256: a474cfe2ab08aa2d4b5aa78f1e131a7d811445e561bea2a6d931b13d5d182be5

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