Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cb777734df4b36…

MALICIOUS

PDF

92.3 KB Created: 2021-05-08 11:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 438f70362cf5f2f24e2c7718335458f0 SHA-1: c03b6e3fedb0cb504a840b7f21ac564a2b01609c SHA-256: f8cb777734df4b36995a70178359032e749f3673abbe09c842a3d72107730d23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9967

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
  • 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://baarspo.ru/strik?utm_term=reading+like+a+writer+francine+prose+download PDF link annotation
    • https://cdn.sqhk.co/lutadamafe/hiicjhA/lowest_airfare_to_las_vegas.pdfIn PDF document text
    • http://zamuxodub.22web.org/81889536451.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/gjjfgfz/ubereats_fleet_app.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/lhhbdjg/kedirotusozalilurixeleteg.pdfIn PDF document text
    • http://nunovoxiwanafuz.getenjoyment.net/nuwexupajoroviwedoken.pdfIn PDF document text
    • http://wumokejo.iblogger.org/pipufotezovizidilidu.pdfIn PDF document text
    • https://cdn.sqhk.co/kenalexuvexu/6vBiajc/56379227574.pdfIn PDF document text
    • http://tamakedesununod.mywebcommunity.org/caballo_de_troya_1_gratis.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/fajetufekejo/graduation_program_cover_templates_free.pdfIn PDF document text
    • http://nufufud.epizy.com/97957432933.pdfIn PDF document text
    • http://xezaretidatoro.onlinewebshop.net/82549530569.pdfIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/dalomozatobademazapega.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/how_do_you_mount_a_panasonic_tv_on_the_wall.pdfIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_5c6b162431864342881241f945966dd8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/vufesivimofafo.pdfIn PDF document text
    • http://tinejamuwaki.epizy.com/30934509919.pdfIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_aaa76b7436b54162b7b4a758b9c05699.pdf?index=trueIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_346f1bd2f436462ea3e043b18859c52e.pdf?index=trueIn PDF document text
    • http://golofupatawef.epizy.com/app_lock_apkmonk.pdfIn PDF document text
    • http://fukorow.epizy.com/engineering_drawing_n1_book_download.pdfIn PDF document text
    • http://setavafajo.epizy.com/naraxidi.pdfIn PDF document text
    • http://jutekoj.epizy.com/vocabulary_workshop_level_b_unit_6_answers_choosing_the_right_word.pdfIn PDF document text
    • http://punumakiwibase.rf.gd/vetoneveso.pdfIn PDF document text
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_c75cb37afb874eef9c0be05a4bef8e3a.pdf?index=trueIn PDF document text
    • http://vujewoperat.rf.gd/13674482888.pdfIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_8246e4101fd44267a901b891d99cf800.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_off00012955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12955 5484 bytes
SHA-256: d7d72413c711d173cf54fd179a7e1bf3384203b79182ba095082c45e1e1bd1ca
font_01_sfnt_off00013c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C32 11000 bytes
SHA-256: a21441eee03c1e0c2d7ba63da0c01c1e5e4d14d17bd358e248802cf4062df282

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