Malicious PDF — malware analysis report

Static analysis result for SHA-256 256c84120eac3086…

MALICIOUS

PDF

78.7 KB Created: 2021-04-07 19:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 278c9cb287d790f47e4cc24662a26119 SHA-1: 72fb70da3ab8ac452623a1dab81afa0618a083d8 SHA-256: 256c84120eac3086bc3b81364cd0db1c87de975354f67ef28b3e071db24542c2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

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://bologen.ru/strik?utm_term=what+is+the+strongest+tribe+in+wings+of+fire PDF link annotation
    • http://wuzejava.22web.org/lolebeteparumugup.pdfIn PDF document text
    • https://mufebukevep.weebly.com/uploads/1/3/4/0/134096334/merisazabu.pdfIn PDF document text
    • http://cetop.xyz/cbse_6th_class_maths_textbook_solutions_chapter_1tviv8.pdfIn PDF document text
    • http://uablog.website/baresotadiriwidabamitalk1ns.pdfIn PDF document text
    • http://bijatutolime.iblogger.org/59160864893.pdfIn PDF document text
    • http://lowwsaw.xyz/374518746560zqxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410975/normal_5fe15eba2ad14.pdfIn PDF document text
    • https://sabizedikidoxar.weebly.com/uploads/1/3/2/6/132681903/70fd49ca19.pdfIn PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/femebofubamovixal.pdfIn PDF document text
    • https://wilubiluzitewi.weebly.com/uploads/1/3/1/4/131413550/5069402.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368229/normal_5fcbbfa04cecb.pdfIn PDF document text
    • http://tehnoprom.org/44960890946kvr87.pdfIn PDF document text
    • https://nenusobodi.weebly.com/uploads/1/3/1/4/131406558/f30dcf49d5.pdfIn PDF document text
    • https://novuwujuvum.weebly.com/uploads/1/3/0/7/130776589/bavavowafowugon_nugukulijugad_nagejazi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vizebafep.epizy.com/moguvetijezegotizabe.pdfIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_45e1368625cf4e2a86462d4d43cd6e5f.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_52815fc78f554def8da7c5a88928ac6b.pdf?index=trueIn PDF document text
    • http://lepawebeno.rf.gd/what_battery_for_2004_toyota_corolla.pdfIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_a46f27073f3e475ba3e4f7c8aec4751c.pdf?index=trueIn PDF document text
    • https://b0b8c8c5-0de0-49ea-8337-0a56b8a4e65f.filesusr.com/ugd/bf9dfc_f59a93358b74450790be0c0a5277eb53.pdf?index=trueIn PDF document text
    • http://bekonoxidolu.rf.gd/graphtec_ce5000-60_factory_reset.pdfIn 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_off0000f5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 5244 bytes
SHA-256: 98b85f4579e7cdd55516adb449ffd56eee48a314264b9f68819fdf1294a232d8
font_01_sfnt_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 11124 bytes
SHA-256: 8b7cc8b849ea7379a1af6bb740ae71085f5b315417d25c0271d1b169af6520a4

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