Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8353c09746b1d2…

MALICIOUS

PDF

77.9 KB Created: 2021-03-31 05:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ad24e9b1e4470581bdba1d0d1fa69e2b SHA-1: 848a21945039ce9479098adf07d0484aee3e1b48 SHA-256: be8353c09746b1d25b816e18bb50a62499c1c60bf5cb3ec72a6284b671fca7ac
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 0.9992

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://golowaki.ru/123?utm_term=dead+or+alive+xtreme+3+bikini+guide PDF link annotation
    • https://cdn.sqhk.co/xororofomed/jmja9gf/18811977214.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/wufujuterinupiseriribaese9s.pdfIn PDF document text
    • http://afracheat8.xyz/social_science_research_simple_definitionpic62.pdfIn PDF document text
    • http://istlan.space/41533694238pmoso.pdfIn PDF document text
    • http://criticcxck.space/79981672566lsgau.pdfIn PDF document text
    • https://cdn.sqhk.co/tokebamojos/ghij79w/flatfit_find_rooms_and_roommates_for_rent.pdfIn PDF document text
    • https://cdn.sqhk.co/daxozazon/b04L3hb/54664489251.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/nexofebixozebodimid6a31v.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/ajiW2gc/48883307959.pdfIn PDF document text
    • http://ryduslim.website/curso_de_biomagnetismo_dr_goizwiiz3.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/Hhb8mhg/43903386361.pdfIn PDF document text
    • http://im-marceting.site/ab_inbev_sabmiller_merger8psi2.pdfIn PDF document text
    • http://slimerecipe.org/is_ethene_polar_or_nonpolarm2dyh.pdfIn PDF document text
    • http://mosquito.codes/silapukazoboxidubegouexa2.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/bjcOigi/download_drift_max_world_mod_apk_rexdl.pdfIn PDF document text
    • https://cdn.sqhk.co/kisoxukapab/fdigfuZ/6048651032.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_71bfed2191f44023a5864e32482a1e62.pdf?index=trueIn PDF document text
    • http://kiwexenuraxenab.rf.gd/keurig_2.0_filter_change_youtube.pdfIn PDF document text
    • http://bawujirilo.epizy.com/jixomi.pdfIn PDF document text
    • http://midowuvebadol.rf.gd/visual_basic_2010_full_tutorial.pdfIn PDF document text
    • http://xikunajuverew.rf.gd/kotigisufanuduwap.pdfIn PDF document text
    • http://gemebam.rf.gd/howard_miller_clock_chime_rods.pdfIn PDF document text
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_5a8fee1ae58e493e993636cd458b9ef2.pdf?index=trueIn 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_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 5460 bytes
SHA-256: c6f869f8f890288875809bea18b100136040d1a5efadeeca2c688bd74c69d371
font_01_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 11876 bytes
SHA-256: f2698280a5a20681f67cd552536d6a1b13d6a670bbaee1d4817e92919246d70a

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