Malicious PDF — malware analysis report

Static analysis result for SHA-256 5daa4a82bf0d79ec…

MALICIOUS

PDF

80.1 KB Created: 2021-03-31 07:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f545822dcb7fe10311e1f7ca2dffe474 SHA-1: 556535a83fbf210522c29fe548f8a44f8ffaa520 SHA-256: 5daa4a82bf0d79ecbbe2617830d134f9656aa5c1c0b616066774a767bf48bec3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many pointing to disposable or unknown hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential tracking or campaign-specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/123?utm_term=anger+of+stick+5+unlimited+game
    • http://kartaidatodemeleri.com/21323359765iyopr.pdf
    • http://glossywp.online/tevopatekekobunilexq5fys.pdf
    • http://hamlikjorettoop.ru/how_to_order_a_regular_hot_coffee_at_starbucksc9eqk.pdf
    • http://lupokixez.22web.org/jsw_roofing_sheet_dealers_near_me.pdf
    • http://lnstagramverifiedbadgeservice.com/185008814117hgc3.pdf
    • http://prizinsta.online/fire_alarm_sounds_twice_then_stopsbztum.pdf
    • http://mybiol.site/basics_of_networking_and_communicationd7gjn.pdf
    • http://mitsumoro.ru/where_is_the_limit_switch_located_on_a_garage_door_openerwr0fv.pdf
    • http://mefizilexofe.66ghz.com/23316593918.pdf
    • http://begetus11ppz.xyz/what_size_battery_does_a_garmin_heart_rate_monitor_takekpfzn.pdf
    • http://wrestling-mma.com/wd_my_cloud_home_8tb1kdwc.pdf
    • http://iwhite.space/business_english_vocabulary_test3t699.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_bf103081d87241cc9ee049da3d89ca8c.pdf?index=true
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_785620da8ef84d4698ca82e6d7c753e7.pdf?index=true
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_3de4dca003f24f979818c2ed879cff88.pdf?index=true
    • https://s3.amazonaws.com/fogibi/technical_drawing_giesecke_free.pdf
    • https://94ac7338-8c66-48ed-b7e4-01cccba3eff0.filesusr.com/ugd/9b8421_55a134119ea04314b9c370b62e40327f.pdf?index=true
    • https://s3.amazonaws.com/jezobasit/49411670036.pdf
    • https://s3.amazonaws.com/rilexazejuzovep/hiren_boot_cd_iso_file.pdf
    • http://nolagevupuxuje.epizy.com/81309170131.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_off0000ef76.bin
3659a7cfb1da2b22b8ade42379edbbd234ffa72e811503621ce671fc5071717c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 5516 bytes
font_01_sfnt_off00010235.bin
f316b57fedd02b3436d4494ca921f67af454fe480709fcae80a21f0657b46069		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 22592 bytes

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