Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53b40de5350d52e…

MALICIOUS

PDF

76.3 KB Created: 2021-03-10 14:48:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2076df7a956226ce2238c5c559a77f3 SHA-1: 267d7143267fa6c9604ea1b0efcb91e3f7165708 SHA-256: c53b40de5350d52ee7e06360a5fc3a69b54fed4429e553f9c5c606ebd0b17707
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary malicious URL being https://lozipotod.ru/strik. This heuristic, combined with ML classification and ClamAV detection, strongly suggests a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/strik?utm_term=3d+face+mask+bracket+made+in+usa
    • https://cdn.sqhk.co/tixunudixa/eTghpHB/24987297014.pdf
    • http://aires.fun/free_backup_software_for_android_phonesoheaq.pdf
    • https://cdn.sqhk.co/zanivuwiduvo/igjhIIe/neostrack_gps_computer_price.pdf
    • http://wabiferofuvud.mygamesonline.org/python_2.7_set_methods.pdf
    • https://static.s123-cdn-static.com/uploads/4406166/normal_5fe5300b8f42c.pdf
    • https://cdn-cms.f-static.net/uploads/4416659/normal_6043ff81039de.pdf
    • http://airbin.top/30365231001e69od.pdf
    • http://zobotalemogi.sportsontheweb.net/planeacion_estrategica_de_una_empresa_agricola.pdf
    • https://cdn.sqhk.co/labojime/5DQgjhi/final_fantasy_brave_exvius_evoke_esper.pdf
    • https://cdn.sqhk.co/dejenuluzew/hchgggM/climbing_plants_for_fences_australia.pdf
    • http://rifijetuvijilam.medianewsonline.com/briggs_and_stratton_service_and_repair_manual.pdf
    • https://cdn.sqhk.co/wesaduleb/ggjcHid/my_talking_tom_hack_download_apk_mod.pdf
    • https://cdn.sqhk.co/givinonu/gigcejb/theme_park_app_gionee.pdf
    • https://cdn.sqhk.co/potiribuwuf/bduijhc/train_controller_salary_rio_tinto.pdf
    • http://xorabawik.medianewsonline.com/vejivakaveg.pdf
    • http://hotita.space/gurubouokog.pdf
    • https://cdn.sqhk.co/xobakidanav/7ZLiQih/smash_ultimate_tier_list_maker.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_6b03b33bcc1b4a07b57f27999e54a3a7.pdf?index=true
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_07b5e97318734a47b934240316b0885d.pdf?index=true
    • http://naxesabefadufu.atwebpages.com/tutotufinume.pdf
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_bda632ccdc8e40028dab9e8ab02a3eb9.pdf?index=true
    • 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_off0000ee4e.bin
7b8832abca46243ac439d67d4ed3a008b5a521c05377e13355ea352c9d01cb24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 5408 bytes
font_01_sfnt_off0001009f.bin
bf20e93839d67b59d2b8d9b523495f999423e1ef0051754f819401e1a20f91ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1009F 10384 bytes

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