Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86c066bc6667508…

MALICIOUS

PDF

74.1 KB Created: 2021-03-15 20:18:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 305b43d523010f50fcc2679e54910059 SHA-1: d7ffbe8bca62b5bbca6d6b654dc49a6e69204013 SHA-256: b86c066bc666750879b204f506bd11c9b4f54428c9d40a94b0319ced8cf70338
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a primary one pointing to 'dafemum.ru', suggesting it's designed to redirect users to a potentially harmful site. The document body's text, 'Can u collect rent while in jail in monopoly', appears to be a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=can+u+collect+rent+while+in+jail+in+monopoly
    • http://gibelineg.sportsontheweb.net/rofirusiginoze.pdf
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/4363724.pdf
    • http://wedasuf.getenjoyment.net/47590138024.pdf
    • https://kabugumaka.weebly.com/uploads/1/3/6/0/136099465/bukibor.pdf
    • http://juzajikadig.22web.org/adobe_photoshop_greeting_card_template.pdf
    • http://tijuruwiku.22web.org/meaning_of_argumentative_essay.pdf
    • https://xukonupuzifig.weebly.com/uploads/1/3/4/6/134621954/repomopenasi.pdf
    • http://najetaxu.mygamesonline.org/22530498234.pdf
    • http://fevevafo.medianewsonline.com/loxurapizudalavemageruf.pdf
    • https://nigerizebamogut.weebly.com/uploads/1/3/4/5/134596745/8437054.pdf
    • http://creditstar-kabinet.com/matlab_programming_textbookybikx.pdf
    • http://medway24.com/65975808031ox6iz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/divelikubapiwaj/anime_streaming_apps_android_reddit.pdf
    • http://jitawidavez.atwebpages.com/fazotegegetajavepetekelul.pdf
    • https://s3.amazonaws.com/jupudizadid/algebra_2_word_problems_worksheet_with_answers.pdf
    • http://fufagarafe.epizy.com/30452128846.pdf
    • https://s3.amazonaws.com/kozewuposoridil/bss84p_6433_tma1_datasheet.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_off0000e454.bin
e34eae6df6602c9e2053241e3badd6ce6b0c91ef7324325f193eba85a2ce4815		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE454 5168 bytes
font_01_sfnt_off0000f5d4.bin
a093e5f504fe98d46b4e42fb1541c9b370720b840e9e4272d3e28bff6dea8acb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 10804 bytes

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