Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c64d4e4b4ac774b…

MALICIOUS

PDF

77.0 KB Created: 2021-02-18 04:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d42c20dd1bfddeb41df12e9f9129c99b SHA-1: d25552f7ef937344055577a7d1b6b73578078221 SHA-256: 9c64d4e4b4ac774b65f7ea7a916679af3b5b2c9579ee85a8fb657951190ff8ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to deliver malicious content. The PDF structure and embedded URIs indicate an attempt to direct the user to external, potentially malicious, websites.

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://bologen.ru/wix?keyword=ath%2527taros+toa+guide PDF link annotation
    • https://cdn.sqhk.co/rajunakeb/ighcoha/hero_rescue_rope_puzzles.pdfIn PDF document text
    • http://mazanatur.space/gmat_official_guide_2020_bundle_3_books1ayk8.pdfIn PDF document text
    • https://rumevupalod.weebly.com/uploads/1/3/0/7/130739773/matafitagajuxubuf.pdfIn PDF document text
    • http://firstdoctor.xyz/worry_free_money_shannon_lee_simmonsqr2yq.pdfIn PDF document text
    • http://zekoselu.22web.org/32656750232.pdfIn PDF document text
    • https://cdn.sqhk.co/runusamopit/yhcmI85/merge_gun_shoot_zombies_mod_apk.pdfIn PDF document text
    • https://wutiduxa.weebly.com/uploads/1/3/5/3/135300785/cf19b5141ba45.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/iiOQiey/wordscapes_level_8530.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/eCgiJgc/big_bang_racing_2_mod_apk.pdfIn PDF document text
    • https://xivapumi.weebly.com/uploads/1/3/1/6/131606059/fubaluwibusi.pdfIn PDF document text
    • http://braco.ru/legetewkc1z5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454304/normal_602aec73d57aa.pdfIn PDF document text
    • http://securespot.ru/yamaha_banshee_350_repair_manual4z3jo.pdfIn PDF document text
    • https://romiwewigases.weebly.com/uploads/1/3/2/6/132682929/lokole.pdfIn PDF document text
    • http://soldatskaya6.ru/kikolevaxubojubulojthg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bovotefetola.rf.gd/lesatosizidana.pdfIn PDF document text
    • http://puwagof.rf.gd/letter_d_worksheets_free_printables.pdfIn PDF document text
    • http://bevonox.epizy.com/44575381867.pdfIn PDF document text
    • http://zerakunutage.epizy.com/advertisement_script_format.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_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 5076 bytes
SHA-256: cd692b38db459265d92ff95bc8a99054d298ab041b29d64a786d5af3b073ee82
font_01_sfnt_off00010395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 10252 bytes
SHA-256: a7da87f05c77696a2b89594d6bac61345999ba5ca5e1a47270458562494383d9

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