Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e10ce88f0a9bb4…

MALICIOUS

PDF

83.7 KB Created: 2021-03-27 11:35:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5c8e9aa67711fa6440f47fc12c0a6917 SHA-1: 388958e4a0272a0bbc0005c08576943702147be6 SHA-256: f2e10ce88f0a9bb4e244ed9ebc559b0d88f179e9fbe0153cd6174c0be57ba846
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, suggesting it is part of a phishing or SEO spam campaign. No scripts were extracted, but the presence of numerous external links suggests a lure to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/award?keyword=a+burglar+s+guide+to+the+city+pdf PDF link annotation
    • http://zhigina.ru/luromegu0y2lq.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/fij5ick/survival_rate_of_colon_cancer_stage_3c.pdfIn PDF document text
    • https://labuxodapiju.weebly.com/uploads/1/3/4/4/134492440/b51f1b54.pdfIn PDF document text
    • https://jipuzalo.weebly.com/uploads/1/3/4/6/134693454/5599487.pdfIn PDF document text
    • http://vexoxem.scienceontheweb.net/propaganda_techniques_book.pdfIn PDF document text
    • https://fegilekupajot.weebly.com/uploads/1/3/4/4/134404616/d87022.pdfIn PDF document text
    • https://kezidixujaroko.weebly.com/uploads/1/3/4/0/134040737/5779805.pdfIn PDF document text
    • https://dirusase.weebly.com/uploads/1/3/1/0/131070798/tajadobumikujej.pdfIn PDF document text
    • https://cdn.sqhk.co/xekutenupi/jbhaCja/wojowigubugibuvotoge.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/fvyWifS/55505961812.pdfIn PDF document text
    • http://zelopaqq.xyz/blackjack_strategy_chart_6_decks5nxre.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_567607ee174f4c7994b7bf0d1830239f.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_621e414be8e64fd4a0de1c859d2cc61c.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_bec42621edea488d9574717c29b0cdb9.pdf?index=trueIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_2d30efc92a7a4b6d9c89a160f338d25e.pdf?index=trueIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_c060d50c008543f3ab7a638173ccf097.pdf?index=trueIn PDF document text
    • http://bekusisit.atwebpages.com/zibojazawikomife.pdfIn PDF document text
    • http://dufobirufo.atwebpages.com/55900098272.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_off00010735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10735 5648 bytes
SHA-256: eabdea8ce03100d1d4accb9d6999d984c134fee5f0874d78309efdeb79d93047
font_01_sfnt_off00011a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6B 12456 bytes
SHA-256: c1deaa49b413caa48f0ce119940a881b1f5f43d6da0336d695149d32aa78da15

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