Malicious PDF — malware analysis report

Static analysis result for SHA-256 448e8e7414c1af90…

MALICIOUS

PDF

68.6 KB Created: 2021-06-08 21:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 202c989fba7553634e6900b8aaef9192 SHA-1: 40e6550e31f386cc3409d6d3b3c8f2c10f2f1370 SHA-256: 448e8e7414c1af90f926aa86f7615a9c2eaf233fc04dac0b7a92ab3c129f6c24
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one prominent URL pointing to `https://queure.ru/pbw?utm_term=constructing+graphs+worksheet`, suggesting a phishing or malware distribution lure. The presence of embedded JavaScript, though not fully detailed, further supports the potential for malicious actions such as downloading secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://queure.ru/pbw?utm_term=constructing+graphs+worksheet
    • https://static.s123-cdn-static.com/uploads/4484359/normal_5ff5a5224440a.pdf
    • https://fewevivib.weebly.com/uploads/1/3/0/8/130813821/41655f.pdf
    • https://static.s123-cdn-static.com/uploads/4453105/normal_5fcef478cf9f6.pdf
    • https://cdn-cms.f-static.net/uploads/4466680/normal_6034f3102dbd5.pdf
    • https://zopewurexolo.weebly.com/uploads/1/3/4/5/134519391/1094403.pdf
    • https://cdn-cms.f-static.net/uploads/4365652/normal_6059bf2232b4f.pdf
    • https://vowinerini.weebly.com/uploads/1/3/4/3/134385114/bepefedugiti.pdf
    • https://jepiweluzobadur.weebly.com/uploads/1/3/5/3/135300479/tejabekolopumile.pdf
    • https://fuvalodonof.weebly.com/uploads/1/3/4/0/134012518/7306500.pdf
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/sokumejudibote.pdf
    • https://gajunepaki.weebly.com/uploads/1/3/4/7/134717041/1699814.pdf
    • https://gejowarog.weebly.com/uploads/1/3/2/7/132740172/logak_muzajegature_fijulaxuke.pdf
    • https://cdn-cms.f-static.net/uploads/4476577/normal_5fd63430970f9.pdf
    • https://static.s123-cdn-static.com/uploads/4464730/normal_5fe26a4e9cf54.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zixereves.pbworks.com/w/file/fetch/144739572/why_did_they_cancel_ant_farm.pdf
    • http://zuvuwiro.pbworks.com/w/file/fetch/144703527/tozadulefipozodedeli.pdf
    • http://katafuzum.pbworks.com/w/file/fetch/144618192/93264011484.pdf
    • http://nimogomaw.pbworks.com/f/polk_audio_psw505_12_powered_subwoofer_manual.pdf
    • http://dejulagimu.pbworks.com/f/how_to_stream_audio_on_discord_phone.pdf
    • http://zufogopojut.pbworks.com/w/file/fetch/144489987/32250807631.pdf
    • http://sukagafamo.pbworks.com/f/8012792914.pdf
    • http://xalomuzavege.pbworks.com/f/vujuveteresojixu.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_off0000d0a3.bin
a65f6a206a18ed6bb681805cdc5e596633cb72e0a8f005cf2a0f8accd90b7d5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A3 5224 bytes
font_01_sfnt_off0000e277.bin
18ef361a779f16d6e4a91a7d5ca04aaa0a01cbc3834fbf925eaa46033b450f09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 10616 bytes

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