Malicious PDF — malware analysis report

Static analysis result for SHA-256 8698c9bc82162d35…

MALICIOUS

PDF

93.0 KB Created: 2021-04-01 14:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c28ed274bcc53c061a65d966b2e1f28f SHA-1: 7c8b7c64a2e7af1819af777f8762342a394b5ccc SHA-256: 8698c9bc82162d35b3ae490a96d4c86c21728d818a81572436c9aac461a3cbbe
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to job experience, likely a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=do+you+need+barista+experience+to+work+at+starbucks PDF link annotation
    • https://cdn.sqhk.co/wadelovelo/CXGhfcP/68672579274.pdfIn PDF document text
    • http://podarokinsta.online/63098583928o07yy.pdfIn PDF document text
    • http://infokurs.design/157874969217ymrp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453532/normal_5ff37607ed7bb.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/pirates_of_the_caribbean_game_softonico7bs5.pdfIn PDF document text
    • http://it50disconto.pro/85222010982r6kwb.pdfIn PDF document text
    • http://mebelintera.ru/dem_hemirelik_bakm_planrd0il.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461232/normal_5fe4e4bc14282.pdfIn PDF document text
    • http://koreanluxe.com/pride_and_prejudice_darcy_castlewcha8.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/ihPzicN/62911678795.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/HhjeVYj/28023089126.pdfIn PDF document text
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/e2c8724c6a4304.pdfIn PDF document text
    • https://cdn.sqhk.co/laxefotogulo/f88ieD4/z_nation_what_happened_to_addy_season_4.pdfIn PDF document text
    • https://mofaxogarapew.weebly.com/uploads/1/3/4/7/134771612/5d5cce5defcde.pdfIn PDF document text
    • https://cdn.sqhk.co/mamidusidozu/Dd0nFjf/87070221325.pdfIn PDF document text
    • https://rukufutuseju.weebly.com/uploads/1/3/4/7/134748195/193087.pdfIn PDF document text
    • https://lagomumudalo.weebly.com/uploads/1/3/2/6/132681699/5093540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483842/normal_602661e01eb7c.pdfIn PDF document text
    • http://pagefufobixew.22web.org/astaghfar_ki_barkat.pdfIn PDF document text
    • https://jaluzirilunotu.weebly.com/uploads/1/3/2/6/132681851/e8895.pdfIn PDF document text
    • http://smartradiobf.ru/free_crystal_grid_templatest157e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468259/normal_604d0a7a76d82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://midelex.epizy.com/free_trade_area.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_off00012c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1F 5500 bytes
SHA-256: fb4c385c1e362d336e867ae04f0b14a77e6807f7f9a0e0b720c6ee2c5e2c81e9
font_01_sfnt_off00013f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F02 11624 bytes
SHA-256: d31bca80443ae2fd7b4b0b7de84b1fd11559301cb04fa5e398d7a3e558da8e2f

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