Malicious PDF — malware analysis report

Static analysis result for SHA-256 047d0da554c63fd0…

MALICIOUS

PDF

77.9 KB Created: 2021-06-10 03:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fc0dc0f116e85356c493e9de4be38d5 SHA-1: d7701f88c7cfb63cd82d6bdef6248a32ef6aefd3 SHA-256: 047d0da554c63fd02d474518c0fc19a37f49fde1e05cf1e8828d0a09e15bd1f0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary URL suggesting a lure for a 'screen recorder'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links and the nature of the heuristic firings point towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/pbw?utm_term=screen+recorder+for+1gb+ram+phone
    • https://jiwedizuku.weebly.com/uploads/1/3/4/3/134310564/1332799.pdf
    • https://tetagusupawuwag.weebly.com/uploads/1/3/4/5/134586179/891b0c3f86c00.pdf
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/bedufaxupoweba.pdf
    • https://jexumaravoza.weebly.com/uploads/1/3/4/2/134265375/keropuriwudenoleli.pdf
    • https://static.s123-cdn-static.com/uploads/4497081/normal_5fff63015a831.pdf
    • https://kabuvegezukab.weebly.com/uploads/1/3/5/3/135325093/kevax_zonufa_nuguj.pdf
    • https://panenojaro.weebly.com/uploads/1/3/4/4/134482399/fulebojufunapezad.pdf
    • https://tisitijalazog.weebly.com/uploads/1/3/6/0/136017937/lutovawera.pdf
    • https://static.s123-cdn-static.com/uploads/4369908/normal_5fecf0cd6c600.pdf
    • https://static.s123-cdn-static.com/uploads/4465396/normal_5ffc30261fff9.pdf
    • https://gijegemolu.weebly.com/uploads/1/3/1/3/131380899/tijikij.pdf
    • https://static.s123-cdn-static.com/uploads/4417834/normal_5fe3f2a5c4e1b.pdf
    • https://tozuriko.weebly.com/uploads/1/3/1/4/131437247/a7902c3236.pdf
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/wozinowas.pdf
    • https://cdn-cms.f-static.net/uploads/4418556/normal_60502858b7755.pdf
    • https://jozimegif.weebly.com/uploads/1/3/4/5/134528335/3886965.pdf
    • https://cdn-cms.f-static.net/uploads/4426088/normal_606e812c0b31a.pdf
    • https://tubuwixufadone.weebly.com/uploads/1/3/5/3/135315283/9254872.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pusavivo.pbworks.com/f/47653181906.pdf
    • http://zigunef.pbworks.com/w/file/fetch/144750252/solving_quadratic_equations_by_graphing_and_factoring_worksheet_answers.pdf
    • http://najajadux.pbworks.com/f/comparative_public_policy_anneliese_dodds.pdf
    • http://pinurakus.pbworks.com/f/gcu_writing_style_guides_and_templates.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_off0000f041.bin
cf932b385dd6d93a94883f25b1a7e338473ff598cbc4e5e769868dee6a2d193b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 5652 bytes
font_01_sfnt_off00010357.bin
0ebe5402adf461d0d736a4a61af4c78d2b485d46b2f2ccabd55aed6c5b93a8d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10357 11328 bytes

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