Malicious PDF — malware analysis report

Static analysis result for SHA-256 02c4b9df943cabb1…

MALICIOUS

PDF

83.9 KB Created: 2021-04-03 12:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1740c632f6a44a7afb032773dd2c1996 SHA-1: cba59965927d0f6af06d584a1c0e04904290358f SHA-256: 02c4b9df943cabb180a07573c6a6ebb8f19753892505c5be947f8e1f1a9a7ece
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of links to external PDF files hosted on various domains, many of which are disposable or redirect to malicious infrastructure. The document body, though heavily obfuscated, suggests a lure related to updating router firmware, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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://dafemum.ru/strik?utm_term=how+to+update+my+motorola+router In PDF document text
    • https://cdn.sqhk.co/nogawevorus/kGijtfP/79054255199.pdfIn PDF document text
    • https://zawuziwoju.weebly.com/uploads/1/3/1/6/131636930/kobevufomizumojezusa.pdfIn PDF document text
    • https://niruzezigup.weebly.com/uploads/1/3/4/8/134889773/pikeluxiteguda.pdfIn PDF document text
    • https://dufavepuxafolim.weebly.com/uploads/1/3/4/2/134266173/41c16668a4430f.pdfIn PDF document text
    • https://xigowobil.weebly.com/uploads/1/3/4/6/134645495/4856089.pdfIn PDF document text
    • https://vekewofamir.weebly.com/uploads/1/3/4/1/134131384/vumozuwuwike.pdfIn PDF document text
    • https://linowatudevenur.weebly.com/uploads/1/3/4/5/134599813/lojoje_sulenunev_pebotipuvif.pdfIn PDF document text
    • https://penebiji.weebly.com/uploads/1/3/5/3/135346042/kojidogifi.pdfIn PDF document text
    • https://woxevodojagub.weebly.com/uploads/1/3/4/6/134623787/kagalisejagonojer.pdfIn PDF document text
    • https://nusiteraj.weebly.com/uploads/1/3/5/3/135347212/sodoxovutoxukasodu.pdfIn PDF document text
    • https://kulegireketo.weebly.com/uploads/1/3/5/3/135325025/sonukagivujabi.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/e2Xje5l/what_is_an_ent_surgeon_called.pdfIn PDF document text
    • https://pedulexonevexo.weebly.com/uploads/1/3/0/7/130740508/bedudutejo.pdfIn PDF document text
    • https://telisawe.weebly.com/uploads/1/3/4/4/134466193/4bbb04fe8a.pdfIn PDF document text
    • https://xatiletovolut.weebly.com/uploads/1/3/1/4/131409128/c336df7db4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://034b020c-baab-45d1-b3ff-c950d21f9178.filesusr.com/ugd/3c93bc_6385cfb9a92a40a1ba68c0f0a7756355.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_44a8a4d135874b46babb41fe5c772586.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/wobep.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/13232773050.pdfIn PDF document text
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_d2f7c31b1c044cab87740f51caad0bbd.pdf?index=trueIn PDF document text
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_af5edb56546245b6a65d6a7ce3420222.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/are_schools_safe_during_covid_19.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/79063282134.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/wedding_couple_holding_hands_images.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5D 5084 bytes
SHA-256: b5ccc3adc7ad902a699e34bbe03ec1b49ac5219e9b1f6b7a60dbf5370a2e91d5
font_01_sfnt_off00011da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA6 10764 bytes
SHA-256: a1c9c443e0d2730334e0caf8d0806307a452f29abb8438a2a6480edfcae79df9

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