Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fb13c3c56f5c53…

MALICIOUS

PDF

81.8 KB Created: 2021-04-24 12:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f9b6882e1b22583b21fa833abb48058d SHA-1: 48d9df722f7e8b75170a5e2e2d39197497d7ba44 SHA-256: 71fb13c3c56f5c533d736c3a4dcac6ba18ce6dad45647184e9c90114cd394bb7
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 designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to lead users to potentially harmful content.

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://botokaw.ru/strik?utm_term=my+mom+and+me+book+printable PDF link annotation
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/fivet-fenomitalaneb-nujidal.pdfIn PDF document text
    • https://vurabagugodemox.weebly.com/uploads/1/3/1/1/131164039/kuvavaguligi_koworimu_rebafizawakig.pdfIn PDF document text
    • http://nuzadovokebin.iblogger.org/home_income_and_expenses_spreadsheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_6018be63c6d78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_601e7444f415e.pdfIn PDF document text
    • https://lonupuvajofova.weebly.com/uploads/1/3/4/3/134341927/5400619.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410030/normal_6004cfa7b0302.pdfIn PDF document text
    • https://borojixupoluba.weebly.com/uploads/1/3/5/3/135316148/wasakuvorado.pdfIn PDF document text
    • https://dozevexenunapaf.weebly.com/uploads/1/3/4/0/134017655/debijijelom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_60697261e42bb.pdfIn PDF document text
    • https://tebukebodo.weebly.com/uploads/1/3/1/3/131381901/34a9e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414152/normal_5fc5e9d4937b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428335/normal_603f80d00cd76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_6059d7930154b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473919/normal_6012565042844.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://futiwani.rf.gd/10th_kingdom_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee93310-d9de-4ad9-8818-dbd57185d33d/61269341759.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5585959b-336b-4a1c-b721-fc687fe249d3/how_long_do_dyson_rechargeable_batteries_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab857ed-41fb-43aa-ae2e-e1f120cb0c66/zebra_zt410_printhead_part_number.pdfIn PDF document text
    • http://zukanimi.epizy.com/catalytic_naphtha_reforming_reaction.pdfIn PDF document text
    • http://domozutelopo.rf.gd/binod_chaudhary_book_free.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_off00010195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10195 5236 bytes
SHA-256: f11770a2d16b716a52532babfa4fb6adda5318514e3c51f8723d22a7b9bc5929
font_01_sfnt_off0001135b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135B 10960 bytes
SHA-256: 2e63f3157341822772cdd657cbb7c808d9cefce75f74399641778a7ce2785578