Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4155b216f8b0f1…

MALICIOUS

PDF

78.0 KB Created: 2021-03-24 10:29:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0615e0b3300837f787fcc39a3d4f8124 SHA-1: d4117afacfd6cd830f743cc6745b66c9b6f2b9ff SHA-256: 4b4155b216f8b0f144f55a2bc85ba57cdb477b04b351d05c5a2203a38fbc06bc
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URIs, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. The PDF structure and embedded content, while heavily obfuscated, indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=kul+tiran+leatherworking+patterns
    • https://cdn.sqhk.co/noxisoture/gf3xzYv/chris_stapleton_new_song_starting_over_lyrics.pdf
    • http://electriccannoz.club/14513542654qr878.pdf
    • http://linunewilut.mywebcommunity.org/83848165366.pdf
    • http://disclosures.space/prparation_concours_inspecteur_dgcco1j56.pdf
    • http://raisinsapp.pro/how_to_calculate_instantaneous_speed_given_time24saw.pdf
    • http://pikejofopon.mypressonline.com/how_much_turkish_steel_does_the_us_import.pdf
    • http://jamilemoderazif.22web.org/bartenders_guide_download.pdf
    • https://cdn.sqhk.co/gobavata/jhbjjii/small_world_money_transfer_promo_code.pdf
    • https://cdn.sqhk.co/fugutexifi/UwijjhQ/wosejajalujasatiwunafo.pdf
    • https://cdn.sqhk.co/bodosuruwalu/jeRidjd/61248423587.pdf
    • http://gemofesane.medianewsonline.com/ges_cost_accounting_syllabus.pdf
    • http://nusamovepi.22web.org/11055880022.pdf
    • https://cdn.sqhk.co/ferudati/9mFIwjh/hay_day_game_for_pc_play_online.pdf
    • http://gratoraama.website/bawaxonumezixmqu7b.pdf
    • http://premiumpornclips.com/blank_hang_tag_design_templatehzdd5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_e014e23fe4e9417c9df335921c170c63.pdf?index=true
    • https://s3.amazonaws.com/dovulavavo/45267192752.pdf
    • https://e012ec00-e8e8-475f-a96b-80cab2ad705b.filesusr.com/ugd/3f1139_56598d93a26b480187ee3fb1e96a4cbf.pdf?index=true
    • https://s3.amazonaws.com/bojafazes/albania_visa_application_form.pdf
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_591bd38b68b24cfba9dae4cbfd4c3516.pdf?index=true
    • http://tulakitukubipi.epizy.com/balance_sheet_of_apple_company_2017-_18.pdf
    • https://s3.amazonaws.com/vexeliku/42237398617.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_off0000f11d.bin
fc07ca14cf209dabb6d2bb64c6dbf6c7555fda6fca410ef541423681ca4b7e76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 5204 bytes
font_01_sfnt_off000102de.bin
f881669ce1519b6e2bd8b47c137b4585dff60a9dbba0479d5e17c982142bd3fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 11260 bytes

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