Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6114da8d186da88…

MALICIOUS

PDF

67.8 KB Created: 2021-02-19 13:27:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a3adbd9c892244caa1b40cd1f1525dcc SHA-1: dac9ffc6a0af42398fd442b79fca2b5b7dccc2bb SHA-256: f6114da8d186da888c2f86c8b09f0b4f4d7a6a66030f10783850f08a94a0ce02
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme designed to lead users to malicious sites. The embedded URLs, such as https://jottigo.ru/strik?utm_term=wireless-n+wifi+repeater+forgot+password, are likely part of this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=wireless-n+wifi+repeater+forgot+password PDF link annotation
    • https://kaginugopaz.weebly.com/uploads/1/3/4/3/134310825/5443952.pdfIn PDF document text
    • https://zisupozukubowad.weebly.com/uploads/1/3/4/6/134678668/32684a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460975/normal_600dba849b4f4.pdfIn PDF document text
    • https://zuzilumapodebaj.weebly.com/uploads/1/3/1/3/131382406/pisanuraxawi.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/d91cb1ce1ec7f.pdfIn PDF document text
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/veroxe.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/APheihi/pete_the_cat_my_buttons_song.pdfIn PDF document text
    • https://ladukupubavar.weebly.com/uploads/1/3/0/7/130776836/jumovuxedomejex_fajuzifazasa_livesinol_visatefe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386081/normal_5fe59cfaa768d.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwatak/fgdQhfe/color_word_interference_test_cotan.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/75Mifje/history_channel_vikings_season_5_episode_1.pdfIn PDF document text
    • https://cdn.sqhk.co/bibilofefi/g1hamij/87938182700.pdfIn PDF document text
    • https://cdn.sqhk.co/bimonabozo/uyIWhdX/max_brooks_zombie_survival_guide_recorded_attacks.pdfIn PDF document text
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/dufaniwefipuboful.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/ruzenijatodoxewuset.pdfIn PDF document text
    • https://cdn.sqhk.co/popuzanuguw/ihjipZ1/hit_the_roof_testo_e_traduzione.pdfIn PDF document text
    • http://dlinkap.localIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muvarelo/semajenuxumejetaji.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_off0000cbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFC 5348 bytes
SHA-256: 7b6cbe4817a18d382b8eecd68a21b703eccf13cb7a270a59a12168ee7b29d790
font_01_sfnt_off0000de5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5B 10588 bytes
SHA-256: ab4df1879d29419ae2da13cbe48597a9f046337e87fab44779bda9ff965bede1

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