Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a3cc439d5e0413…

MALICIOUS

PDF

76.5 KB Created: 2021-03-20 12:58:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0a4ca33670be721f597b5aec234727a4 SHA-1: 10bc1f88ce2b4ab4fc2f25bbd21e81ff860f90c6 SHA-256: 28a3cc439d5e04135b0ed8f886207718d3492ae388138116a42abab921310aca
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 0.9997

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://gimoguvi.ru/award?keyword=tontos+de+capirote+francisco+robles+pdf PDF link annotation
    • https://logomeso.weebly.com/uploads/1/3/1/4/131438572/832893.pdfIn PDF document text
    • http://ditevaxasazel.22web.org/78448450009.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/S2ihjbV/efootball_pes_2021_mobile_app.pdfIn PDF document text
    • https://duzopotubesafes.weebly.com/uploads/1/3/4/8/134890215/f6f15ca70.pdfIn PDF document text
    • http://kersita.space/77328392363d3ztf.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/izrhcih/blade_attacking_2018_ep_1_eng_sub.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/Fuvhiij/98710930926.pdfIn PDF document text
    • https://wozavosasegug.weebly.com/uploads/1/3/4/5/134509229/c849eb6.pdfIn PDF document text
    • https://rubusabulolow.weebly.com/uploads/1/3/5/3/135326577/9eb69.pdfIn PDF document text
    • https://cdn.sqhk.co/rotusorukazi/NicK6hh/last_hero_survival_battleground_commando_mod_apk.pdfIn PDF document text
    • http://rankingcoach-seo.com/843524495376p6iq.pdfIn PDF document text
    • https://xaduregenotilok.weebly.com/uploads/1/3/4/7/134711203/taxuvukasodawefi.pdfIn PDF document text
    • http://bachanalytics.com/75546281189c67ue.pdfIn PDF document text
    • https://cdn.sqhk.co/boketumejipa/chbUqSm/monsters_inc_pinball_panic_play_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fowebilafem.rf.gd/citadels_board_game_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/96753381515.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/bosonusi.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/besejiwibugoxaba.pdfIn PDF document text
    • http://sajurewe.rf.gd/penatalaksanaan_asbestosis.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/plural_form_of_word_abacus.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_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 5236 bytes
SHA-256: cfa6c32d8d97a2052cd0be93714837a7fc637e50d601de4b2d92ad457ad90717
font_01_sfnt_off0000fc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8E 11912 bytes
SHA-256: 3602f60a2f1a1085d33bb9086fab21abd69af8ff4f2291e5a7fc6571b53f35b9

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