Malicious PDF — malware analysis report

Static analysis result for SHA-256 dedc69c53a672d35…

MALICIOUS

PDF

66.3 KB Created: 2021-02-17 19:56:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 74ab9bd27b67cbcd7648f86fb0db8d04 SHA-1: d8041881d25b3bb6385ec5efdc09c7b6f5f08b3b SHA-256: dedc69c53a672d354eceda122f2f44ba0b2014835c8a440f804d6a8836a6e6f0
134 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that mimics a search result for a product's value, likely intended to trick the user into clicking it. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detection confirms it as a phishing trojan. The ML classifier also flagged it as malicious with high confidence.

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://leonvi.ru/strik?utm_term=how+much+is+a+5th+generation+ipod+touch+worth PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490138/normal_5fe4327396986.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/ihgAjcI/billie_eilish_lockscreen_tumblr.pdfIn PDF document text
    • https://cdn.sqhk.co/lipetebo/cgcqibR/jilasajerupofosirel.pdfIn PDF document text
    • https://cdn.sqhk.co/tesigasefaxe/hjghi3I/claw_machine_costume_baby.pdfIn PDF document text
    • https://cdn.sqhk.co/legezuseg/ygeC7Ib/98617686071.pdfIn PDF document text
    • https://cdn.sqhk.co/kelanadu/kjbhj9X/brimming_river_meaning_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/rojisixel/GmXhf5a/microban_24_hour_cleaner_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/fpklarW/x_screen_recorder_free_download.pdfIn PDF document text
    • http://zewojapu.22web.org/66181869132.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/qjciij3/infamous_synonym_words.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/juvosi/11461632502.pdfIn PDF document text
    • http://barajirotufaz.rf.gd/vaweniwivuwe.pdfIn PDF document text
    • http://dabinuxorolukew.epizy.com/sistem_ekonomi_amerika_serikat.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/21669576997.pdfIn PDF document text
    • http://bivuraxut.rf.gd/patapedudurunepuzarenudat.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/penejoxojeku.pdfIn PDF document text
    • http://fobapisarut.epizy.com/xurofotevakolabal.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_off0000c320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC320 5632 bytes
SHA-256: 137e9c1a62da3f5fffe51d25931eb5f8026d6f6655e34b4e1253521d0cce694a
font_01_sfnt_off0000d632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD632 11128 bytes
SHA-256: b7dd2a7b909dd52cf61172a36e7ea0e709c292fc51072b97661e660c41637277

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