Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5da004d33a6c3d5…

MALICIOUS

PDF

88.0 KB Created: 2021-04-05 02:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c300b93ef7e01ac364536cba65147bc5 SHA-1: 9fc059c3eba770b2356b149b69eb4ec8222bdc1e SHA-256: f5da004d33a6c3d58136cb0647d71f13b7a6fd24f81e2ec7ecdb0428ce7b0dcd
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by the ML classifier and ClamAV detection. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains keywords related to popular downloads, reinforcing the lure tactic. No scripts were extracted, but the presence of numerous external URLs suggests the primary attack vector is directing users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://resalured.ru/wix?keyword=the+walking+dead+no+man%2527s+land+apk+download PDF link annotation
    • https://cdn.sqhk.co/tosuwukiwate/jhjhvtV/murder_mystery_party_kit_halloween.pdfIn PDF document text
    • http://bukupiduge.mypressonline.com/autopilot_system.pdfIn PDF document text
    • https://cdn.sqhk.co/niwexifa/nighbUc/49013529970.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawifen/hcuieme/53153458549.pdfIn PDF document text
    • https://cdn.sqhk.co/makulowujip/he5Khb7/43927889090.pdfIn PDF document text
    • https://cdn.sqhk.co/pidagasew/Wngdlgi/niduxukogopowavukes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/fesivonoloxufelavobejod.pdfIn PDF document text
    • http://rifoxofome.rf.gd/fakaxibanaxefer.pdfIn PDF document text
    • https://4900ecec-7ac1-411c-be2c-b077674085c8.filesusr.com/ugd/493135_9ea3733aec7c431f9c6ed17347b0cf32.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec32f19f-7b85-448d-95da-21474abaa882/brindle_weiner_dog_puppies.pdfIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_3eb76f0a3a704795b80e19ed628e9bdd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d89fa71b-458a-4547-9008-4eaa3a10caea/wupez.pdfIn PDF document text
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_f484f7bb9ef14313ac3b300777ecc3e2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/072fceb2-8b2d-4dbc-aa44-2ad79384f7ab/25492240214.pdfIn PDF document text
    • http://bisodusar.epizy.com/lowrance_hds_5x_installation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c08c612-7426-4ba4-ac4d-f7cd0f87148d/garmin_forerunner_305_battery_wont_hold_charge.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 5080 bytes
SHA-256: b929ebfc08c7f1fdeea924c6cf1f9b3bcd1f1bd4fbd9f521ca31a33b507e54fa
font_01_sfnt_off0000fa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 5416 bytes
SHA-256: e779adad4f5760f5d5627cd4170d9a24f2ab230f086b10d9b5749018e657a2bf
font_02_sfnt_off00010cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_03_sfnt_off0001154e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 10820 bytes
SHA-256: 9fe38b265d8d0dd9f91c5042763911131b3cace9df86a2a8be99540a690250f1
font_04_sfnt_off00013a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A70 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449