Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c435518722357ac…

MALICIOUS

PDF

76.6 KB Created: 2021-03-31 01:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22f196f2535e72fd83fb5a73867e2110 SHA-1: a0295a1ed75319d59c6ba9a88216760660b9a3f9 SHA-256: 3c435518722357ac926f28d5bdccb3aa9f67192e148090a2f3ff1e233461bfef
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host numerous URLs.

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-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://jacksth.ru/strik?utm_term=bosch+500+series+dishwasher+shpm65z55n+best+price
    • http://zufikolukak.22web.org/adverb_clauses_of_time_exercises.pdf
    • https://gagofabujinu.weebly.com/uploads/1/3/0/7/130739012/7289401.pdf
    • https://mibofadap.weebly.com/uploads/1/3/1/6/131637701/fasunoguxoz-dosananig-kelatotuvoderu.pdf
    • https://lisogawe.weebly.com/uploads/1/3/5/3/135312855/5705400.pdf
    • https://tuxupurevulivi.weebly.com/uploads/1/3/0/8/130813143/2d4bd45d0d6906.pdf
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/jodimew_genevaroka_vosujixumofas.pdf
    • https://duxojavuse.weebly.com/uploads/1/3/1/4/131483254/zibewonuvite_susarubexitiw_fipikod.pdf
    • https://budekimezarusij.weebly.com/uploads/1/3/5/9/135964348/7236052.pdf
    • https://direwuberegenis.weebly.com/uploads/1/3/4/3/134361890/5332290.pdf
    • https://radixukawatezod.weebly.com/uploads/1/3/4/6/134645496/2838344.pdf
    • http://musagar.iblogger.org/65330239637.pdf
    • https://rejukikigukaw.weebly.com/uploads/1/3/5/3/135387704/e1fa2.pdf
    • http://wirobigi.medianewsonline.com/renikidojeseb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fivemawafazixi.epizy.com/5e_character_sheet_doc.pdf
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_ab6962d11b184bd88819f2217e4fc11d.pdf?index=true
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_5f21da77d9104d5fb2394ddcbc144344.pdf?index=true
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_38de77fdea8d4cc6b65d4617389307d5.pdf?index=true
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_883837bc700e4381a295465197eaf2b8.pdf?index=true
    • http://kapirexazi.onlinewebshop.net/67917754992.pdf
    • http://peronilekovo.rf.gd/adidas_mens_pants_size_guide.pdf
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_34b81812cf7545ea9b84008c77ee49f9.pdf?index=true
    • http://volemefejosi.rf.gd/do_you_italicize_court_cases_in_chicago.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_off0000ea27.bin
99075b9461f9bd2f742b0321e1f6d9936aacb294bae3d07b3150217febe6b8c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 6032 bytes
font_01_sfnt_off0000fe9f.bin
aabfcb7d8f1d4ad722f463febf5f8df129cd249afcb5b0b8c8de7e79a227965e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 11352 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.