Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff2a6ad0e45c086…

MALICIOUS

PDF

94.6 KB Created: 2021-04-24 03:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a6c7ede0ac31a067a0fc1357972c296f SHA-1: efbba581f4a6d9c61c214886523d087bb3d597c5 SHA-256: cff2a6ad0e45c086d5d5c6d15beecc8a8d15117a1780caf57d4f71897b6932cb
146 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('jottigo.ru') that is likely used to host a phishing page or a second-stage payload. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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=no+reset+button+on+harbor+breeze+remote PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473340/normal_605282f313c74.pdfIn PDF document text
    • http://vobefoli.iblogger.org/how_to_reset_ge_monogram_fridge.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/jumasasag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501231/normal_603b07a6379ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417221/normal_603d518023f6e.pdfIn PDF document text
    • http://vikolumubibo.scienceontheweb.net/kutake.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/what_is_considered_non_western.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_60355b22ed3c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401525/normal_600c463f4abea.pdfIn PDF document text
    • http://zelegurelo.iblogger.org/teguvoparusex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453326/normal_6057bf88daa0a.pdfIn PDF document text
    • http://zibodotuf.mygamesonline.org/catalogo_avon_campagna_14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lesexugisitu.rf.gd/sekixide.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/xasorexefomoni.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/xaxafesezefojaxafemex.pdfIn PDF document text
    • http://sawutex.rf.gd/dyson_dc41_clogged_hose.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/call_of_duty_mobile_apk_offline.pdfIn PDF document text
    • http://soriwolawiri.epizy.com/86505945852.pdfIn PDF document text
    • http://ziwuxokivob.rf.gd/larger_foraminifera.pdfIn PDF document text
    • http://wupafar.rf.gd/18343756784.pdfIn PDF document text
    • http://nununad.myartsonline.com/7589732716.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_off0001330f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330F 5052 bytes
SHA-256: 724fade48d309240176a1429f8518b7d49d8e9daa6f04e9b0850af625741c486
font_01_sfnt_off0001441c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441C 11544 bytes
SHA-256: 29954d4f9a928e76dccff10ff07bdcffa9b47d6f9c6fdf96fb058c9c8502b19f

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