Malicious PDF — malware analysis report

Static analysis result for SHA-256 45211c2e1c4008e5…

MALICIOUS

PDF

95.8 KB Created: 2021-04-19 08:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d671e466cf44731498ff12c07b04c549 SHA-1: 226a17e650fb3557dabd6971910ba011848c3b47 SHA-256: 45211c2e1c4008e5b7676dd683de37801b61c25618789850665969d10a518fca
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many pointing to disposable hosting or redirector infrastructure, suggesting a link farm designed to distribute malware or phish users. The heuristic firings indicate the PDF links to known malicious redirector infrastructure and is part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=mfj+259b+schematic+diagram In PDF document text
    • https://lagomide.weebly.com/uploads/1/3/5/3/135304015/fazigunuzatav.pdfIn PDF document text
    • http://tefukuk.iblogger.org/75988542693.pdfIn PDF document text
    • https://famelugosa.weebly.com/uploads/1/3/0/8/130873944/fb60d9905d.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/73941900629.pdfIn PDF document text
    • http://lejunuzegakikuv.mypressonline.com/93995805067.pdfIn PDF document text
    • https://gojesewemuvi.weebly.com/uploads/1/3/2/6/132681304/momedivezu-jitogilifire.pdfIn PDF document text
    • https://nobasaxekomu.weebly.com/uploads/1/3/5/3/135322761/4175205.pdfIn PDF document text
    • https://xikewipevugid.weebly.com/uploads/1/3/1/3/131383679/54226bc745ff.pdfIn PDF document text
    • https://judenebubiz.weebly.com/uploads/1/3/4/6/134656374/a9c8a4aacba40.pdfIn PDF document text
    • https://vixixufabajuwe.weebly.com/uploads/1/3/1/1/131163632/dinosumudi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2e6e0ea8-97c2-4f02-addd-ceb016b98d50/wiroxixeduwafato.pdfIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_68fd40f43607489bbe9c179670444a19.pdf?index=trueIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_7940f3f596244398a08ec3102bcd9bc6.pdf?index=trueIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_249bbc77a2bf48a58f77146b5eea2ee4.pdf?index=trueIn PDF document text
    • http://pixafur.atwebpages.com/9785599621.pdfIn PDF document text
    • http://rivenoke.onlinewebshop.net/tamil_names_starting_with_s_for_baby_boy.pdfIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_f7b610b0b64945258590b21efb68797b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a338d4-502b-4128-8caf-ee3f0132202c/gebixesukewi.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_519a5df1ba604aa4a386d601faf5a972.pdf?index=trueIn PDF document text
    • http://fepasike.epizy.com/welding_merit_badge_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d9ff637-7f7c-4694-9717-3f435913d625/76436427179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a76522-42bc-4859-a5a2-8e9a7a456f2f/exalted_2e_backgrounds.pdfIn PDF document text
    • http://lupijatewesonev.rf.gd/financial_accounting_balance_sheet_example.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001279f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279F 5608 bytes
SHA-256: 9fb02bb1dde03c485776b2eb9eb7b2683037f8674cf59e1ca96761cb022c991f
font_01_sfnt_off00013ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB5 11936 bytes
SHA-256: 9368c8bf65dcda2d42762a9f2029a55f557bede6f7d2f8e442014b3ca5f0d181
font_02_sfnt_off0001636a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1636A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230