Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7b505242425e02…

MALICIOUS

PDF

74.1 KB Created: 2021-03-07 20:03:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b438df3cc39b90ff620dca26cc9dadb9 SHA-1: fdce22bf39b5f758decd763abebd8c43f0d91ecb SHA-256: de7b505242425e026ea8407fb56b71b2e484505ead73024903f082b51df51305
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=qubool+hai+10+july+2015+dailymotion PDF link annotation
    • https://cdn.sqhk.co/jotoselu/ihidJhe/dual_monitor_wallpaper_hd_3840x1080.pdfIn PDF document text
    • https://godowipi.weebly.com/uploads/1/3/4/5/134520373/c5a02708.pdfIn PDF document text
    • https://xigukiburid.weebly.com/uploads/1/3/2/7/132741693/2044997.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/jcjbbXQ/xoronugufejabijumufise.pdfIn PDF document text
    • https://cdn.sqhk.co/livoluxuwad/upRifek/dixobos.pdfIn PDF document text
    • https://bunosepe.weebly.com/uploads/1/3/1/3/131379858/jotima-vawetisa-gidomeva-vuwadederatitu.pdfIn PDF document text
    • https://totakolexab.weebly.com/uploads/1/3/5/3/135391630/towame-gigegigumuxix-kazarejaj-teporunepaziven.pdfIn PDF document text
    • https://rufogeror.weebly.com/uploads/1/3/4/6/134664275/muzoli_viwaterigeju_tojopizozoboze_megogelenit.pdfIn PDF document text
    • https://cdn.sqhk.co/pawosuku/BijFigG/advertising_agency_internship_mumbai.pdfIn PDF document text
    • https://norabemomo.weebly.com/uploads/1/3/0/9/130969424/3154980.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/e5gcOFn/46953682026.pdfIn PDF document text
    • https://relulime.weebly.com/uploads/1/3/4/3/134384492/vivoki_tezunu_kinadipabilofag_vijavitil.pdfIn PDF document text
    • https://wizugelavuri.weebly.com/uploads/1/3/5/3/135325487/8425469c2f82a.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/jd3giiY/68931619434.pdfIn PDF document text
    • https://cdn.sqhk.co/rodosidebo/WiaKchi/top_5_brawlers_in_brawl_stars_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zubeleboju.epizy.com/46498867997.pdfIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_eed89baa3c8f43dbaabca38f38365a26.pdf?index=trueIn PDF document text
    • http://pisasegobure.epizy.com/breville_countertop_oven_manual.pdfIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_ac7f2e9a454d4a36b5f614856c78531e.pdf?index=trueIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_0238e1bd83a349b3aa2210b7baf3b869.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_off0000e29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29A 5620 bytes
SHA-256: 65876b7db5c2894c537d8b85f3e5938fbdbf8a154d606616bbc78caba2eade68
font_01_sfnt_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 11332 bytes
SHA-256: e228a95ae3f7f689995444dbb120cc881c8aa4ec7b48279d1f046cb021b1e9a7