Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb67085545f7b53…

MALICIOUS

PDF

86.4 KB Created: 2021-02-21 01:17:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6f41661d77ad33f6e050d3216733bc3e SHA-1: c6542c09a2603212a5107e54cd275d9c361fd665 SHA-256: ceb67085545f7b53b0d4b42f392d75e847650c1860cd2cb4eb60a5d0b1fe0809
186 Risk Score

Malware Insights

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

This PDF file contains a significant number of external links, many hosted on disposable domains, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious content, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=how+much+is+bright+line+eating+boot+camp PDF link annotation
    • https://cdn.sqhk.co/dilobowuz/zqhfhif/49481448812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_602367f053f0c.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/701773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5fd6e2b061fc9.pdfIn PDF document text
    • https://cdn.sqhk.co/lazodadevab/Qzjiiee/word_nut_level_1075.pdfIn PDF document text
    • https://gubuwogufulero.weebly.com/uploads/1/3/4/6/134608521/maduwotasuso.pdfIn PDF document text
    • https://biligimanud.weebly.com/uploads/1/3/1/4/131454089/496d6f47.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/rapobigipudurubabe.pdfIn PDF document text
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/d120a184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450244/normal_5fdc3f1e468d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419626/normal_600cf3f051154.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481675/normal_6006aa52f1484.pdfIn PDF document text
    • https://cdn.sqhk.co/togareguko/nHjafid/home_photo_studio_program.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/hggijia/highway_rider_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/X8X5mja/lizejex.pdfIn PDF document text
    • https://cdn.sqhk.co/pozedezupase/fhhig2P/slink._io_snake_game_download_for_pc.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
    • https://s3.amazonaws.com/sewamos/banizazizapevatada.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/jquery_ajax_post_mvc_formcollection.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_off00010326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10326 5424 bytes
SHA-256: f80afc081977782a822b9a6d3b4b67ec4545fbcd13ddf2da7c8024280e3d8f27
font_01_sfnt_off0001157c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157C 11396 bytes
SHA-256: 11b63ecdacee3f9d6a62e1f7c3db890c536127ba5c104b9465af5fae2eee3c54
font_02_sfnt_off00013c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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