Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf098d65eb150628…

MALICIOUS

PDF

76.9 KB Created: 2021-05-08 23:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f4234088cb25d89f47256392ce73d38f SHA-1: 9e70fe7149424c1e0b7e6cf64838baff4fac188f SHA-256: bf098d65eb15062890fc0f730b764238d71b19ab1f7c940a2c591025210f2711
186 Risk Score

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. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://ponafet.ru/strik?utm_term=what+are+the+types+of+valves+%2526+pumps+- PDF link annotation
    • https://guxumexowe.weebly.com/uploads/1/3/3/9/133999944/33cce652b6635f3.pdfIn PDF document text
    • https://soxiwavarado.weebly.com/uploads/1/3/1/4/131437421/sukag.pdfIn PDF document text
    • http://shop50off.info/3446735273134f97.pdfIn PDF document text
    • http://wusokamojifel.scienceontheweb.net/snow_white_movie_grimm_brothers.pdfIn PDF document text
    • https://juxeduwabup.weebly.com/uploads/1/3/0/7/130775558/3049f176cbd.pdfIn PDF document text
    • http://mebevevi.mywebcommunity.org/australian_open_2020_printable_draw.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/hgjhbEY/free_text_editor_for_mac.pdfIn PDF document text
    • https://juvetobewuneted.weebly.com/uploads/1/3/3/9/133997509/xalokinojoxapunuzel.pdfIn PDF document text
    • https://wojawodexof.weebly.com/uploads/1/3/4/6/134673733/852c8.pdfIn PDF document text
    • https://cdn.sqhk.co/mibuguxinise/1piiihb/this_means_war_song_christian.pdfIn PDF document text
    • http://about-central.com/xufotupevakogugikuzoaq9c6.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/gjge3lh/bubble_puzzle_epic_match_3_shooter.pdfIn PDF document text
    • http://zaxegod.getenjoyment.net/62606519541.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/bdm_post_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/88288292663.pdfIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_e5fb23cc7467491fb1974f7e0f4a4b9f.pdf?index=trueIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_02113596fef24fe3b5b2e9e1110d6505.pdf?index=trueIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_3b44d51a0b38497da7f0452ae3b979e5.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_12f7931379784eacb699804fa05c7cca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xelimewat/what_is_a_mathematical_proof.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_off0000f1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 5164 bytes
SHA-256: db52ee67cc85f24b6ebe0d2dceeeaacd90eca4d25f2388ba3c76af070e75f93b
font_01_sfnt_off0001036b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 10272 bytes
SHA-256: 25e36877c870992fd66b6ea978c26721e346c99779d7006fbdf4cb9884919ee7

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