Malicious PDF — malware analysis report

Static analysis result for SHA-256 14b9313b5dcbaf63…

MALICIOUS

PDF

89.3 KB Created: 2021-03-24 08:12:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 439e800f9860f83fb584c14f5b0879c2 SHA-1: 0dc19358b9ada6c07906ddca7b71b662ac48ed66 SHA-256: 14b9313b5dcbaf63a6b650f81becdaa05a4fc729a405c0bccbe15b7a13b360a6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and it contains a large number of external links, indicating a link farm or phishing attempt. The presence of external URIs and a link farm suggests the PDF is intended to redirect users to potentially malicious websites. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://vilenefex.ru/123?utm_term=baldi%2527+s+basics+free++ios
    • http://zijafanovidiz.sportsontheweb.net/zuwajupata.pdf
    • https://cdn.sqhk.co/fupokiwil/hh4ibhj/wallpaper_for_gamers_hd_4k_free_fire.pdf
    • https://wazepitufakox.weebly.com/uploads/1/3/4/7/134735855/f6d8a.pdf
    • https://cdn.sqhk.co/wojusipi/mjfFche/walking_dead_cast_season_10_episode_16.pdf
    • https://genunilime.weebly.com/uploads/1/3/4/3/134344847/jenojav.pdf
    • https://rafutukeri.weebly.com/uploads/1/3/1/4/131453201/velaxuzosupo-nemevupigu.pdf
    • https://cdn.sqhk.co/lamajemomu/ejigeih/83840730081.pdf
    • https://vasaradafivoza.weebly.com/uploads/1/3/6/0/136048391/divari.pdf
    • https://zelogevoge.weebly.com/uploads/1/3/1/4/131483318/5441fe01bc7a08.pdf
    • https://cdn.sqhk.co/bafujifi/b1Yhjda/blendoku_medium_level_130_answer.pdf
    • https://cdn.sqhk.co/dujagazatad/cTSAiau/metallica_mp3_ringtone_free_download.pdf
    • https://subafeso.weebly.com/uploads/1/3/3/9/133986831/7334364.pdf
    • http://kuvenumine.mygamesonline.org/vozemerilidefa.pdf
    • http://risumeboze.getenjoyment.net/duvivewov.pdf
    • https://cdn.sqhk.co/sexuzoropa/L26Mtji/rock_out_with_your_crock_out_meaning.pdf
    • https://cdn.sqhk.co/vitimosugu/XjhjiHu/football_penalty_kick_games.pdf
    • https://tenekivosorudo.weebly.com/uploads/1/3/4/5/134596066/f48c35329ac.pdf
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/305343.pdf
    • https://vebovaxuzukikom.weebly.com/uploads/1/3/4/3/134352383/muboxobubetepupewol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/befarekogol/freescale_codewarrior_windows_7.pdf
    • http://vunonam.atwebpages.com/convert_to_word_big_file_online.pdf
    • http://keregimuw.onlinewebshop.net/robotics_engineering_subjects.pdf
    • https://s3.amazonaws.com/lovomijelun/which_portable_basketball_hoop_is_the_best.pdf
    • https://s3.amazonaws.com/zakunafu/selenium_webdriver_tutorial_java_eclipse_with_examples.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010210.bin
d26b43839523cb62cdcd77dec2df855a333841211fc659af0c0757d30b5491f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10210 4840 bytes
font_01_sfnt_off00011287.bin
272efefa10cd16e18ed761a248a97dee87dcaf1dde40ac18d67fbaf44b0730e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11287 16844 bytes
font_02_sfnt_off0001490d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1490D 4324 bytes

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