Malicious PDF — malware analysis report

Static analysis result for SHA-256 1331e9bd7715b849…

MALICIOUS

PDF

75.6 KB Created: 2021-03-26 14:26:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: de0a549cd3f41ea9a813e11bc1041f7a SHA-1: 4ab239a79d5997c40219bd385c46066ba2a48b26 SHA-256: 1331e9bd7715b849ed898c67986a1588ccd56c4492dd71e660a39f60eecee6da
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links disguised as relevant content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a high volume of outbound links, likely for SEO manipulation or to direct users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jottigo.ru/award?keyword=identifying+noun+phrases+exercises+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367625/normal_604f36bfa7260.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/aZyhhkz/gotonozigapaxikejusemajik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_603a8ec2838ee.pdfIn PDF document text
    • https://cdn.sqhk.co/mavixuwaloz/IcjjZig/jiwokuvemosat.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/e96hdgi/spoken_english_course_book_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kujujigufa.epizy.com/12757135727.pdfIn PDF document text
    • http://loxeputogojew.rf.gd/juwanelex.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_a5ef805edf7a4b00813aff0bed3d98b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fabefed-2afa-47a9-8eb7-2e40a32f76cd/17892069814.pdfIn PDF document text
    • http://kutegabirena.epizy.com/nikawufabitesigesowodag.pdfIn PDF document text
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_d4323f13c54d4d3286a74f9dfd529f70.pdf?index=trueIn PDF document text
    • https://1f9cfe0c-d655-4514-b58a-75380282e405.filesusr.com/ugd/d31784_b115061704cb49bdb0b77bb83bf3c3c3.pdf?index=trueIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_57b483d104374628bf7d82c376540bf3.pdf?index=trueIn PDF document text
    • https://f8bd9030-4518-40b4-9047-d478e6ffc17b.filesusr.com/ugd/608fe2_7dfb7e356b0e4062acb04bd438397e1e.pdf?index=trueIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_451dfd61482547a1839fae5bf90df934.pdf?index=trueIn PDF document text
    • http://zewogukanonudut.epizy.com/ariston_gas_oven_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef4ec7e1-8f5b-47a5-9ba5-d421d9a528ac/how_to_run_a_flea_market_booth.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 5492 bytes
SHA-256: fa85c46ca5624dc5d334f1bcd55838d6ccdbc2aaf1a29e9eff2fbc0566d7644a
font_01_sfnt_off0000fcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 11052 bytes
SHA-256: 87cb15a96adf7d001e6a7b7c68d0eb2cd948c121eb548ca740b346f740fc7f61

Open this report in the interactive analyzer, or submit your own file for analysis.