Malicious PDF — malware analysis report

Static analysis result for SHA-256 42da31f9a529448c…

MALICIOUS

PDF

84.4 KB Created: 2021-03-23 16:06:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: dbe8b3aa23130cb7ee7fd343b433964f SHA-1: 282f8d6656f6300513a0962481fe03caeb00bfa9 SHA-256: 42da31f9a529448c48df8829a39161629888d0f9b98a9d4504c3df06d0052fa1
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=6+nimmt+instructions In PDF document text
    • http://fruits-summer.fun/taylor_weight_tracking_scale_instructionsjpc03.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/witirizakajunusejik.pdfIn PDF document text
    • http://fumexijana.getenjoyment.net/b_tech_courses_list.pdfIn PDF document text
    • https://cdn.sqhk.co/jelazeneno/fzheqjb/high_speed_pinball_manual.pdfIn PDF document text
    • http://mazers.fun/the_dictator_cast_borat4ubw6.pdfIn PDF document text
    • https://cdn.sqhk.co/kiwikiza/sluMIig/rosozag.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/gdifHgi/clearview_rc_flight_simulator_crack_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/joremeve/foiguV8/drive_for_speed_simulator.pdfIn PDF document text
    • http://getallcreditscores.info/90060819331jobts.pdfIn PDF document text
    • http://muzabogexetakuz.iblogger.org/aspire_plab_2_notes.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/gukob.pdfIn PDF document text
    • http://torchqbfl.fun/cunninghams_encyclopedia_of_magical_herbs_llewellyns_sourcebook_seriesq0uc8.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/5476185694.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/hgPxhd6/entergy_power_outages_report.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_e2f7a22c04cd45a8a934527847abd3a0.pdf?index=trueIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_11a9753e553f4b63a7ddb95ba74ff390.pdf?index=trueIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_37a619a2b3ba4cb6bafa6a8c0d7dc5fb.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_21d55774e5f94432a053a81a80f5b56a.pdf?index=trueIn PDF document text
    • http://xuvemotoguno.epizy.com/ipad_mini_5_front_camera_not_working.pdfIn PDF document text
    • http://gupatevefojip.myartsonline.com/36150276739.pdfIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_cd0a37a142124b8695c81ab8645eac00.pdf?index=trueIn PDF document text
    • http://gogositanisewu.rf.gd/42685728161.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_a8982f4996e44cc2bea2662d6c6d13e7.pdf?index=trueIn PDF document text
    • http://jazojogebi.rf.gd/ripuxon.pdfIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_f5ee05b4306e48d2bbb0e2237711e6fa.pdf?index=trueIn PDF document text
    • https://aa0e52d0-3c12-4d86-bfd3-e3284f950a51.filesusr.com/ugd/eb1974_ce3251860b024378b73bf9f8207b71bb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10050 4528 bytes
SHA-256: 83750416bb24c223c9b864373cf6acb1ddb6ba3648c6125eb5ba0bd4b41b08de
font_01_sfnt_off00010f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F88 11324 bytes
SHA-256: 740e22347da8b83dd0839997333d1dd5c7e5baaea5c59067c4c3383e7d508f7e
font_02_sfnt_off000135d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D9 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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