Malicious PDF — malware analysis report

Static analysis result for SHA-256 103f470b20a46635…

MALICIOUS

PDF

84.2 KB Created: 2021-03-31 08:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 82c0950b92ca980dff0c7aaa147fbcbb SHA-1: b634f213ce750a6b17f5f63bb0d44a55b5f7ade5 SHA-256: 103f470b20a466358bcd3c48021464096dc57baa79b641ac576855d3842cc76f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farm heuristics further supports this, indicating the document's primary purpose is to redirect users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://mezovuduw.ru/strik?utm_term=how+to+setup+nanostation+loco+m2+as+receiver PDF link annotation
    • http://infokurs.design/academic_phrasebank_2020x7qqh.pdfIn PDF document text
    • http://fapseo.ru/command_prompt_commands_windows_10_cheat_sheetwfs7u.pdfIn PDF document text
    • http://nexojofe.22web.org/best_video_er_for_iphone_5s_free.pdfIn PDF document text
    • http://cardioactiveitalia.site/attack_on_titan_season_4_episode_6_release_date_crunchyrolloeo7u.pdfIn PDF document text
    • https://cdn.sqhk.co/soxesemu/hhdJwgh/uber_driver_income_per_month.pdfIn PDF document text
    • https://cdn.sqhk.co/lasijutag/Gidjggj/lusuritenilefeva.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/gh9Jkjd/frontiere_european_covid.pdfIn PDF document text
    • http://milanbeach.fun/isometric_piping_drawing_software_freero771.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/sjigBje/20_question_ball_game.pdfIn PDF document text
    • http://ruszaimclub.ru/what_does_a_carriage_return_look_like_in_notepadapffd.pdfIn PDF document text
    • http://reduslim-official.website/32136981717i6x4s.pdfIn PDF document text
    • http://sagokorize.22web.org/92494108172.pdfIn PDF document text
    • http://helpcopyright-service.com/nusiwatetikezinikakiwaxwijeu.pdfIn PDF document text
    • https://cdn.sqhk.co/taxuvoguraji/ibjejet/tilijukunenodof.pdfIn PDF document text
    • http://avtoshkola-region26.ru/trevor_noah_born_a_crimej5x1z.pdfIn PDF document text
    • http://sell-toclick.online/how_to_make_a_simple_free_website7huo3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_7f6e83dcddde448db57c2471f5370ea1.pdf?index=trueIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_c77a2a4190cf4ae687afcf390faed2c2.pdf?index=trueIn PDF document text
    • https://f25535ca-33a9-4d84-83e7-6179260772f1.filesusr.com/ugd/be19e1_825e423959114facbc7faddf7f7bce49.pdf?index=trueIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_264e364eeb8f4fb6b650a5ec9b58d28b.pdf?index=trueIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_b487f95fb0c6484ab488e9373b931a73.pdf?index=trueIn PDF document text
    • http://fijosat.epizy.com/bepupipevivibokiwuduv.pdfIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_baa8e229a78f443bbe230cbb34159e34.pdf?index=trueIn PDF document text
    • http://kagilabitivibe.epizy.com/80900505528.pdfIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_867b842b919d47d690603f43647b97d4.pdf?index=trueIn PDF document text
    • http://tetirapop.epizy.com/wifi_booster_app_iphone.pdfIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_78c66cdf350d41798ac3104e1c8fda21.pdf?index=trueIn 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_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 5324 bytes
SHA-256: 08af5b65e68c852a4346c0286d550bda035ff04f74dba9f1fa512834fbf2169d
font_01_sfnt_off00011b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7E 11492 bytes
SHA-256: df3cb642c9a2ae23a34ebab57636169eb4e41fe490963104f5616a7a5cbe8910