Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bb19f5359b8662…

MALICIOUS

PDF

79.9 KB Created: 2021-05-02 15:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7f2997bc15fcd40b762c0666283f9fc3 SHA-1: c14e4709ca3ebbf5872b60efdb398a2e4d2e3086 SHA-256: 83bb19f5359b86622e94532a15dc321d40dc2f9f68201984131fca81baf5852c
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. It contains a large number of external links, many pointing to disposable domains or link farms, suggesting an SEO manipulation or redirection scheme. The embedded URLs are likely used to host or redirect to malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=how+to+learn+first+20+elements+of+periodic+table PDF link annotation
    • https://cdn.sqhk.co/mikevoponage/gegiQak/66142492576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_602a10ed20755.pdfIn PDF document text
    • http://trend-sales.fun/41901274913r3z3q.pdfIn PDF document text
    • https://dosogomufafana.weebly.com/uploads/1/3/2/6/132696174/4706c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474985/normal_6028eb5d1777d.pdfIn PDF document text
    • http://art-practice.org/funny_sms_tones_and_sounds0cbsu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420470/normal_6069774920b30.pdfIn PDF document text
    • https://cdn.sqhk.co/vemetafije/xico1ih/hill_bike_galaxy_trail_world_2_mod_apk.pdfIn PDF document text
    • https://xovigojimere.weebly.com/uploads/1/3/4/8/134854331/2999988.pdfIn PDF document text
    • https://ledijonag.weebly.com/uploads/1/3/4/6/134689342/4657016.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/cXijjey/88104893943.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471109/normal_5ffdf17bbe47b.pdfIn PDF document text
    • https://cdn.sqhk.co/sawijewabob/lMgdibO/state_of_survival_survive_the_zombie_apocalypse.pdfIn PDF document text
    • https://cdn.sqhk.co/wevubuse/ehhFgc3/vasulasujojalewadisikuv.pdfIn PDF document text
    • http://netewe5.xyz/happy_birthday_wishes_songs_free_pagalworldohg84.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CqLhfN7/localizar_mi_android_por_gps.pdfIn PDF document text
    • https://cdn.sqhk.co/xoberuweri/hg9Sha5/29473327357.pdfIn PDF document text
    • https://galujamisone.weebly.com/uploads/1/3/1/8/131871568/melibakadakin_vukef.pdfIn PDF document text
    • http://esagafow.fun/garmin_approach_s60_reviews7vwkh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://16cc4848-9a85-487f-bc1d-da55f68f8448.filesusr.com/ugd/dcf86b_68109e1f8bd1400f83e3782eb4d4c975.pdf?index=trueIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_608b3624637441d9bac50fb9d2f697dc.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 5768 bytes
SHA-256: fad103ede7e770f3e48ac241c077071533d0758001b153813d89bc2c75ebacd9
font_01_sfnt_off00010b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B15 11400 bytes
SHA-256: 27be1f2e750da160674e473032c57b3c650212fc06b01cc762dd63f9dbcaac94

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