Malicious PDF — malware analysis report

Static analysis result for SHA-256 c368dbb17fc677ff…

MALICIOUS

PDF

71.0 KB Created: 2021-02-12 06:52:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 682d712ff89c0111e2623dcff91d6d8b SHA-1: 746e4d6ca0bc11bf4e662a84c4c1bb9b5684782c SHA-256: c368dbb17fc677ff746a25346803290bd8ca3cfb1b2d14584098a725383d00ce
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, many pointing to disposable hosting or known redirectors, suggesting a phishing or malware distribution campaign. The ClamAV detection further supports its classification as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/123?utm_term=juniper+hill+golf+camp In PDF document text
    • https://cdn.sqhk.co/mimofeto/WghRRYK/knock_down_steel_door_frame_installation.pdfIn PDF document text
    • http://hellochildren.online/40475311487gwxu1.pdfIn PDF document text
    • https://tiwapopo.weebly.com/uploads/1/3/0/7/130739059/600657.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/N7ibgc6/57604376256.pdfIn PDF document text
    • https://rebavunegiluzu.weebly.com/uploads/1/3/4/4/134497465/zazele_tesetomo.pdfIn PDF document text
    • http://autokenn.com/list_of_conjunctions_used_in_english3s1n1.pdfIn PDF document text
    • https://zokevuwokonumez.weebly.com/uploads/1/3/4/6/134682223/fubebepu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382003/normal_5ff06093f217c.pdfIn PDF document text
    • https://cdn.sqhk.co/mozopojugode/NgtjhZw/ramimeni.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/fpic7jd/t-_mobile_600_mhz_coverage_map_2020.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/024664.pdfIn PDF document text
    • http://tourist.fish/sonic_the_hedgehog_game_genie0idw5.pdfIn PDF document text
    • http://sfr-espace.best/17951330056bp64z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vakusidoler.epizy.com/66461511807.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_off0000ce05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE05 2968 bytes
SHA-256: afcae459a23cd8fad60e71fa482ed795063b178ca7a96d5a337757ed3e51a98b
font_01_sfnt_off0000d8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AB 5240 bytes
SHA-256: 52f659f9a9f02bdfb2f1d5eb52f9f546ee6e5aabb355b6da359932ae22baf8ca
font_02_sfnt_off0000ea59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 10844 bytes
SHA-256: 2dc1581f783c571993f6502c950e1ebc8e02b99596424fe434dc2570f066065a

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