Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3d2f35f62b3ce0…

MALICIOUS

PDF

73.9 KB Created: 2021-06-01 04:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba432325b687f2cc6e9d433eaac1c01d SHA-1: bad9d889cdd464b31f02b6d51830363e63e5e5fd SHA-256: ff3d2f35f62b3ce0fda0a46639e4fad27cf334452d2caa04a6ffd2aee84339e0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm, with one prominent URL leading to a site offering free software downloads. This suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://infrive.ru/pbw?utm_term=plants+vs+zombies+pc+full+download+free
    • https://static.s123-cdn-static.com/uploads/4367650/normal_5fe55b634de21.pdf
    • https://viwapuse.weebly.com/uploads/1/3/5/3/135306484/xuxexapafaga-kurum.pdf
    • https://cdn-cms.f-static.net/uploads/4493245/normal_6065f4ec3b55d.pdf
    • https://novedoxax.weebly.com/uploads/1/3/4/5/134512377/94a34a784faa7d2.pdf
    • https://wigemixez.weebly.com/uploads/1/3/4/2/134265991/gukar-xuzovufaripo-fumek.pdf
    • https://ralubimuxafoku.weebly.com/uploads/1/3/4/3/134373731/a00429bddc86d6c.pdf
    • https://dulewidojupetor.weebly.com/uploads/1/3/2/6/132695372/2fe80b0e1.pdf
    • https://static.s123-cdn-static.com/uploads/4467912/normal_5fee427a52b01.pdf
    • https://cdn-cms.f-static.net/uploads/4459624/normal_605bdd9bc70dc.pdf
    • https://xelekukoxenafo.weebly.com/uploads/1/3/7/5/137513843/mupedipu.pdf
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/7025257.pdf
    • https://cdn-cms.f-static.net/uploads/4470961/normal_604dae40de6ed.pdf
    • https://pofisuxix.weebly.com/uploads/1/3/4/0/134016862/tebinuriginuwata.pdf
    • https://kepuwizetel.weebly.com/uploads/1/3/5/3/135304134/lapewipirib-tukivijisovuz-dozuravefuraj-jumumuwusijego.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/566f95cc-a688-4fc0-9668-62f07f95a545/76575128922.pdf
    • https://uploads.strikinglycdn.com/files/76d9e37d-98f9-491d-b593-b7a320ee2d30/how_to_draw_cool_alphabet_letters.pdf
    • https://uploads.strikinglycdn.com/files/bb998526-d296-4d3e-ae52-5d7a6160f771/subway_surfers_singapore_hack_download_for_pc.pdf
    • https://uploads.strikinglycdn.com/files/fca7353b-bc0f-4a14-ba0e-cbf7c71f3441/jokajoxiwamuvab.pdf
    • http://bofamawetodo.pbworks.com/f/pure_daily_care_aroma_diffuser_instructions.pdf
    • https://uploads.strikinglycdn.com/files/58a26b5b-e9f6-4a39-af32-33f92fd0298d/how_much_does_an_operations_consultant_make.pdf
    • http://nosiravuga.pbworks.com/w/file/fetch/144433029/riwidiweredatewaji.pdf
    • http://pokatufaxi.pbworks.com/w/file/fetch/144421191/rules_of_exponents_n.rn.1_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/dcd81237-81f1-4ba8-b5ea-51fbfc47e18f/o_mehndi_pyar_wali_mp3_song_download_pagalworld_mp4.pdf
    • https://uploads.strikinglycdn.com/files/f884bc38-a093-4661-9fc7-43d753c40395/4771782389.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_off0000e11a.bin
55d783ef9fb92f9ff62f414ffb5bb2c1b159a256cbc10ad60de67fd6f0c4a988		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE11A 5644 bytes
font_01_sfnt_off0000f453.bin
3855d05ceb6506336a0d947128daf98138ece484f4830bd5583aa9d0814daa8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 11156 bytes

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