Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13357f8d542ba5d…

MALICIOUS

PDF

74.4 KB Created: 2021-05-11 06:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cd850e2c1dab6b8e5a42fc4b7fbf3e6f SHA-1: 9044fa05f75c89d0e6b3a15d989f33d8562b2a7b SHA-256: a13357f8d542ba5dd9c4cddad1b76173ac86d8c659985112e6ff289d0054c9ae
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 0.9998

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://ponafet.ru/strik?utm_term=what+does+a+dry+spell+mean PDF link annotation
    • http://idealslimitaly-ufficiale.site/how_to_write_a_franchise_operations_manual6p25i.pdfIn PDF document text
    • http://rcasino.info/xabedafaresofifewasigboe3b.pdfIn PDF document text
    • http://winoorama.fun/84441304133h0z2o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498404/normal_5feb3d76df1fc.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/ShcBbgi/kesumigifojuwasiborur.pdfIn PDF document text
    • https://cdn.sqhk.co/wevujawej/idhiuie/the_walking_dead_season_2_walkthrough_episode_3.pdfIn PDF document text
    • http://xidasetetobuge.scienceontheweb.net/rsum_d_atomistique.pdfIn PDF document text
    • http://bulibujirifubof.scienceontheweb.net/41081422046.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/dell_latitude_e6410_i7_specifications.pdfIn PDF document text
    • http://wide-mean.top/difference_between_nsdl_and_cdsl7bdpq.pdfIn PDF document text
    • https://cdn.sqhk.co/gajeneset/D7Hathc/vavoxasilo.pdfIn PDF document text
    • http://gugolufixa.mywebcommunity.org/gagup.pdfIn PDF document text
    • http://dontbeshy.xyz/bedroom_eyes_english_subtitles9cocj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414357/normal_5fecc0cb64049.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493541/normal_602fdbb866a0f.pdfIn PDF document text
    • https://cdn.sqhk.co/lukapokobejo/Yjdhhic/doxurotitufenuzan.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/hehjgeg/latifutavuzolapiko.pdfIn PDF document text
    • http://manovina.mypressonline.com/pigugixiwerakawip.pdfIn PDF document text
    • http://prodson.space/twilight_new_moon_full_movie_hd_downloadobadn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 5312 bytes
SHA-256: d0f4ad072d08e2499af1925a85722e0952ab38eecea1076e6773bde28a9dd182
font_01_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 11076 bytes
SHA-256: 1d7303ce715252357bc6a3c7606e5933cf7b5524e0b0746914328bacf4c09471