Malicious PDF — malware analysis report

Static analysis result for SHA-256 d238ac4163de3d64…

MALICIOUS

PDF

78.4 KB Created: 2021-01-02 02:30:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f8dea21beeeace81489408a4bb78c905 SHA-1: 5d7cacd35c875bc4b16f7b72f7c607f4756c8897 SHA-256: d238ac4163de3d645f03bf01f1c06dab90326f255c0cdd37de372c0b19d37de1
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector link pointing to 'traffmen.ru'. Another critical heuristic indicates a PDF link farm, suggesting the document is designed to drive traffic to numerous external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/123?utm_term=demi+lovato+confident+album+leak In PDF document text
    • https://cdn.sqhk.co/sepetuvab/3geihia/xibilupowibasafujamu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367687/normal_5f9877dc442d9.pdfIn PDF document text
    • https://midazumetewafaj.weebly.com/uploads/1/3/4/2/134266273/6a2a41092eff5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370987/normal_5fae7f515576b.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/cghQjj3/troy_united_methodist_church_ohio.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374980/normal_5fca13a32c1a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446496/normal_5fa94dfd5babd.pdfIn PDF document text
    • https://cdn.sqhk.co/lugizumevemu/cQgK8id/breadwinners_meaning_and_sentence.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/0hfDgfY/papa_s_burgeria_to_go_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvajuvewuj/hh6z3gj/entrepreneur_magazine_subscription_south_africa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lonozote/fimamopatejudelevulomel.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/say_something_piano_sheet_music_free_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/siribetepagofajene.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/21695007307.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_off0000e827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE827 5040 bytes
SHA-256: 5cfb4bf659b51155946d56363a10fb79c266e77672e9248b972d4a01513191af
font_01_sfnt_off0000f948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF948 10932 bytes
SHA-256: 17ab0f49457d1feb24dee5439e2b7ed38924b105f08052e00a32d2c001ed269a
font_02_sfnt_off00011e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E65 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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