Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1ff6f91da0f680…

MALICIOUS

PDF

71.4 KB Created: 2021-05-19 20:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5eefcc456166c131dd5879420b27a7e7 SHA-1: 233aea0d51a1be005b481f7d7446182aba570c76 SHA-256: eb1ff6f91da0f6806f3c8ee6d286101685ea19abe8617d32e3eb7a05e32aa36a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one pointing to a suspicious URL that is likely part of a phishing or malware distribution campaign. ClamAV detection and ML classification strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'workbook answers', aligning with a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=cutting+edge+advanced+workbook+answers
    • https://cdn-cms.f-static.net/uploads/4403260/normal_6035335fde54f.pdf
    • https://static.s123-cdn-static.com/uploads/4487184/normal_5fe344bf67d63.pdf
    • https://xexifenenufomag.weebly.com/uploads/1/3/6/0/136082553/6814381.pdf
    • https://cdn-cms.f-static.net/uploads/4460070/normal_6060415c90cb7.pdf
    • https://static.s123-cdn-static.com/uploads/4376858/normal_5fce23e1965d9.pdf
    • https://xexibuwowixuzu.weebly.com/uploads/1/3/4/4/134455615/gepejotilow.pdf
    • https://cdn-cms.f-static.net/uploads/4458618/normal_605d6cb39ac37.pdf
    • https://vijotuwotula.weebly.com/uploads/1/3/0/7/130775401/ziposomapodirozonu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gonima/battlefield_of_the_mind_chapter_1_summary.pdf
    • https://uploads.strikinglycdn.com/files/ae5dea17-46c7-4090-8d28-30186c17fff9/hp_12c_calculator_battery_size.pdf
    • https://s3.amazonaws.com/watajive/how_to_use_the_sedona_method.pdf
    • https://uploads.strikinglycdn.com/files/e41da8e2-6a6b-41f5-90f2-2d3b71101725/94838523742.pdf
    • https://uploads.strikinglycdn.com/files/f767f6bf-c1f9-4ccc-8d61-f31a3a1b7c96/merchant_of_venice_full_text_with_line_numbers.pdf
    • https://uploads.strikinglycdn.com/files/48805a9e-7301-4179-b6bd-d953315371b3/shakespeare_sonnet_130_literary_analysis.pdf
    • https://uploads.strikinglycdn.com/files/fe983fab-90ca-46e9-bb3a-d9e5c5a3b47c/51261566167.pdf
    • https://uploads.strikinglycdn.com/files/8262a534-2d81-43d7-9b9f-011eadb5bac0/fijubanuwugi.pdf
    • https://uploads.strikinglycdn.com/files/821333c6-4a4f-4fac-abd0-8f1b67a93dc2/66331935748.pdf
    • https://uploads.strikinglycdn.com/files/bbe653ce-640a-4c20-bce0-0b2573163da2/tujufivupatimekabeke.pdf
    • https://uploads.strikinglycdn.com/files/a9e07497-1795-41aa-8666-0fd7d6616ea6/what_is_the_best_time_to_trade_binary_options_in_india.pdf
    • https://uploads.strikinglycdn.com/files/e2db6d58-1137-46a0-8b5f-0d538fe93ec8/mr._coffee_iced_tea_maker_replacement_pitcher_walmart.pdf
    • https://uploads.strikinglycdn.com/files/b29cf346-f30c-4bb7-a7f2-3eb33ea01890/numubifunoxike.pdf
    • https://uploads.strikinglycdn.com/files/1786a265-64b7-4bc3-b17e-51951c1feb33/lebopuwamowenonejuxodi.pdf
    • https://uploads.strikinglycdn.com/files/cc88b859-4953-4020-b6ba-150487eaccb8/the_wrong_house_story_summary.pdf
    • https://uploads.strikinglycdn.com/files/7cc8c941-03a6-4782-a7f6-8e73a3f2868b/glock_19_gen_5_holster_iwb.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cce3.bin
10b4a6f52b72ea175059a8c794f8434ed97f40495bb35f8c516a135a4ea67e17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE3 5336 bytes
font_01_sfnt_off0000df2e.bin
5f55b4fd92dde2248fbdce4969f0058d36270ae72476f1cb579ed1111697ba06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2E 15060 bytes

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