Malicious PDF — malware analysis report

Static analysis result for SHA-256 99beed2651499453…

MALICIOUS

PDF

65.6 KB Created: 2021-01-20 06:27:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d4a5e23c3d9b353d61f49347d1683a10 SHA-1: 772d06430ad21d6f911c572bc922c4a85399cd59 SHA-256: 99beed2651499453d769dd30f991bab9aef1f87ea3def8a3165f033c19df31ca
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a prominent one leading to 'jottigo.ru', likely a phishing or malware distribution site. Heuristics indicate the PDF is a link farm hosted on disposable domains, and ML classifiers and ClamAV strongly flag it as malicious. The document body, though heavily obfuscated, contains text related to '1080 ti price', suggesting a lure to trick users into visiting the malicious URL.

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://jottigo.ru/123?utm_term=1080+ti+price PDF link annotation
    • https://site-1177446.mozfiles.com/files/1177446/roll_roll_roll_in_the_hay.pdfIn PDF document text
    • https://kenomuxi.weebly.com/uploads/1/3/4/0/134042647/zalomej.pdfIn PDF document text
    • https://xanovisawedota.weebly.com/uploads/1/3/2/8/132816091/5363438.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/avLjaib/wallpapers_for_iphone_12_pro_max.pdfIn PDF document text
    • https://furimulu.weebly.com/uploads/1/3/1/4/131411024/dopunuxosok_noluri_wugox.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/tar1gia/kozugavidufizadarolekolaw.pdfIn PDF document text
    • https://jafedemigizol.weebly.com/uploads/1/3/4/5/134588438/2474234.pdfIn PDF document text
    • https://cdn.sqhk.co/pomorezolo/hhjchf9/vitamin_b12_foods_vegetables.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nawuxek.rf.gd/kugegusixuvewojumapopivom.pdfIn PDF document text
    • http://fotiworoz.epizy.com/melioidosis_treatment_guideline_malaysia.pdfIn PDF document text
    • http://lusafawapinoxe.rf.gd/trip_report_lufthansa_business_class_a350.pdfIn PDF document text
    • http://nudifezidezi.rf.gd/wagurofepumi.pdfIn PDF document text
    • http://zapofekeba.rf.gd/zasuxemulinusu.pdfIn PDF document text
    • http://vedibovejixi.epizy.com/35160892239.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_off0000c4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D9 4800 bytes
SHA-256: 2f309441188a8f1010d2b626ee00a05d7c6ee14a139e3da9aa8920bced7121f8
font_01_sfnt_off0000d546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD546 11148 bytes
SHA-256: d237d0fa8b1d7a9c76c6ff8d2420274c59e78271d5b2e688006a92f9a08ba645

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