Malicious PDF — malware analysis report

Static analysis result for SHA-256 d492daf81471fe6e…

MALICIOUS

PDF

80.5 KB Created: 2021-03-01 20:49:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9e25152c9747818da020ecfac58daf74 SHA-1: 4eb4bd034ee6d8ed28c00cf9de242decef14a29b SHA-256: d492daf81471fe6ebf7de9fe091dd42c08ab0b80a2a30bb953554557d5d15d6f
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

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/wb?keyword=asp.net%20mvc%20error%20page%20redirect PDF link annotation
    • http://giwitijudaleka.mygamesonline.org/hp_probook_4530s_price_philippines.pdfIn PDF document text
    • https://zinebarovug.weebly.com/uploads/1/3/0/8/130814534/7933297.pdfIn PDF document text
    • http://nagepuxi.22web.org/benurumerezesu.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/bZywgio/rizabopaxu.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/jSgPW2C/fojugenudofikunugumajijir.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/gakilelesemames.pdfIn PDF document text
    • https://gunajogozezulom.weebly.com/uploads/1/3/5/3/135385825/1482044.pdfIn PDF document text
    • http://bekopomulasebi.getenjoyment.net/33259549818.pdfIn PDF document text
    • https://loruwowawerer.weebly.com/uploads/1/3/1/4/131483348/pamifija_balipe_tunotatosurav_wekemaduboja.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/gGhgKhg/perogorojeguxokoluvadut.pdfIn PDF document text
    • http://drnextact.xyz/english_grammar_books_for_high_school_studentsfw9mo.pdfIn PDF document text
    • https://cdn.sqhk.co/tititafoza/idQhiUo/19243184398.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tisigivikevutik.rf.gd/how_to_reset_ink_level_hp_deskjet_2135.pdfIn PDF document text
    • http://gegapitigiz.rf.gd/seekers_notes_hidden_mystery_game.pdfIn PDF document text
    • http://livirava.atwebpages.com/what_is_the_most_powerful_tarot_deck.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/wefukulizijekizadiwurad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 5232 bytes
SHA-256: 354b83f02721099a6eb4b038f5071d78d136b8349f92abaac43d4f69a79fb916
font_01_sfnt_off0000ffe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 11296 bytes
SHA-256: 5a7f1e7e8751e6627ff5c178be0d8ac90dfa83f26c19dfeb253fe76720bd08dd
font_02_sfnt_off0001265a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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