Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2f27ba10beb26e…

MALICIOUS

PDF

74.1 KB Created: 2020-11-11 23:20:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 812b3cd05ec6ac9d18a1743f8c4c7b4f SHA-1: dbce45b0a216eb545dac630b59309e73e7694e8b SHA-256: bc2f27ba10beb26e0dc4bb49060710ce225cfeb12bebafa7166a7c09a97e964b
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ggtraff.ru/123?utm_term=pokemon+go+0.39.18 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4394060/normal_5f9f35593fd0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370525/normal_5f8882f250168.pdfIn PDF document text
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/d759ebb58220a.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/7740020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eeb2104-52b2-4a6f-b763-880c82fb4a99/are_pumpkins_considered_gourds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3da71f-5c82-4edb-960a-e505873ec4a9/single_displacement_definition_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b988b12-4bb1-4f12-9f08-057264afd5be/bissell_deep_clean_deluxe_pet_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce856dcb-3f0c-48d3-8270-de3b221fac3c/17584295593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bb935fc-7350-4988-9fb9-f59c2e5064a2/zagijivokipikuxufoguzela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c13e38a1-cdb1-4516-b4ee-8ac6a5371499/ge_universal_remote_control_manual.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_off0000cc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC10 8040 bytes
SHA-256: 72be79dead6d76a0055a53f1bd432851b98400d33aaeb965133b55f4b83f6003
font_01_sfnt_off0000e6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 5292 bytes
SHA-256: 20b82e1216ce6bd4e34a038fae3148c00aa3097cf26f71bf1e029edef97f81e0
font_02_sfnt_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 10220 bytes
SHA-256: ea6f23225cb3ea186e4e6b076a494a2401ec640b20fdc5fbc90b1b3b365f19a4

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