Malicious PDF — malware analysis report

Static analysis result for SHA-256 875a97fe52af45e3…

MALICIOUS

PDF

77.0 KB Created: 2021-06-07 07:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bd6ba44a9cbe22980d3d5b404f0f2cb4 SHA-1: d233ff9e68c5355e1f8ef49336827ccf135699bb SHA-256: 875a97fe52af45e3eaebae3f53ad57b2694545ead07cc0af193439ee353c0b64
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/pbw?utm_term=hard+color+blind+test+buzzfeed PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4502436/normal_5fe589bc637e7.pdfIn PDF document text
    • https://bozaveruri.weebly.com/uploads/1/3/1/4/131483492/9067207.pdfIn PDF document text
    • https://tekofudarazot.weebly.com/uploads/1/3/1/3/131381521/wivebufiseloro_zurudizikuxazi.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/eb9b173e9a1f61.pdfIn PDF document text
    • https://wexigovepabenu.weebly.com/uploads/1/3/0/7/130738565/a359f5cedec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481841/normal_604d642897cff.pdfIn PDF document text
    • https://nekemefewebewon.weebly.com/uploads/1/3/7/5/137504470/2603130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450353/normal_603d039a4a51a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474223/normal_606d986c729d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419836/normal_601411b9466f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446645/normal_5fd07c1a73527.pdfIn PDF document text
    • https://kuwovewifinux.weebly.com/uploads/1/3/0/7/130775990/virozozawij-babamewube-gorusedunorirot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405437/normal_5ff34609a668d.pdfIn PDF document text
    • https://balerezun.weebly.com/uploads/1/3/4/6/134665840/fegiguro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489716/normal_600921bc82dff.pdfIn PDF document text
    • https://dabawide.weebly.com/uploads/1/3/7/5/137511183/d1dc016b8.pdfIn PDF document text
    • https://fodevasuliweka.weebly.com/uploads/1/3/4/6/134657172/ee1d4cc909d9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405195/normal_60248c9e951f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dejimebez.pbworks.com/f/ligatafomofad.pdfIn PDF document text
    • http://xizegopago.pbworks.com/w/file/fetch/144698901/ponosasose.pdfIn PDF document text
    • http://fubajulak.pbworks.com/f/overlord_light_novel_download_epub.pdfIn PDF document text
    • http://vosebim.pbworks.com/w/file/fetch/144447570/brocade_fabric_os_upgrade_guide_8.1.2.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/safabonekibiligan.pdfIn PDF document text
    • http://pobonagul.pbworks.com/w/file/fetch/144578748/69278394789.pdfIn PDF document text
    • http://xorunezagu.pbworks.com/f/ejercicios_de_diferencia_de_cuadrados_perfectos_resueltos.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/f/skyworth_android_tv_web_browser.pdfIn PDF document text
    • http://pilujibos.pbworks.com/f/tesapesugunez.pdfIn PDF document text
    • https://medlineplus.gov/colorblindness.htmlIn 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_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 5164 bytes
SHA-256: ef10fcf2884bb816d3a9ad57cd1ec92fa039634f7d424fca043f68fb94f94712
font_01_sfnt_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 11064 bytes
SHA-256: 713ba26fdb4d52aa8b78694ac6718b6c978c0e0b81f8fe630b6cdf0c6797b7d1

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