Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ac6b9a14e3162c…

MALICIOUS

PDF

73.9 KB Created: 2021-04-03 16:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d88172719507d4ef97f49abe115b4d39 SHA-1: b3858bb0d92839c0a5d4de723258f0f071f129f3 SHA-256: 21ac6b9a14e3162c70fcc91eb66ea296abe468b8f655aaf346b5a8f646ea126d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded external links, many pointing to disposable domains, which is characteristic of link farms used for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/wix?keyword=combined+gas+law+packet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417658/normal_601f0020cf6cd.pdfIn PDF document text
    • http://ziwewixowele.sportsontheweb.net/ansiedad_por_separacion.pdfIn PDF document text
    • https://kotimujisozun.weebly.com/uploads/1/3/4/8/134880640/8a6a22.pdfIn PDF document text
    • http://tokudujadi.medianewsonline.com/fudox.pdfIn PDF document text
    • https://lutasuboli.weebly.com/uploads/1/3/2/7/132740498/jusugarinovagimisinu.pdfIn PDF document text
    • https://kitawusew.weebly.com/uploads/1/3/4/2/134234725/vazetiwotak.pdfIn PDF document text
    • https://kidodizaramaba.weebly.com/uploads/1/3/4/0/134096495/lifinefuzabopa_zuvuxorozegifo_jifofawe_nasemut.pdfIn PDF document text
    • http://vozivovog.scienceontheweb.net/mojus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_60595572a0b74.pdfIn PDF document text
    • https://murarukaxew.weebly.com/uploads/1/3/4/6/134666391/gijugaroboxebosiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_360d3bce114446ab922870676328c8a9.pdf?index=trueIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_54e9d16695b6498590154a9a11aba85e.pdf?index=trueIn PDF document text
    • http://ziwivazud.onlinewebshop.net/37699809652.pdfIn PDF document text
    • https://cff07a16-13b2-455b-8a78-148a75b158b4.filesusr.com/ugd/cda0c7_ef00b63d97b04bbf9b87adbc3ee69029.pdf?index=trueIn PDF document text
    • https://4c80ca50-31de-4e6f-b265-471620011c4a.filesusr.com/ugd/08c6b7_1fc4e5b6947c4176bc683f3e3fe5e210.pdf?index=trueIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_f7fd8766f0ea4cbbbc7f4af2317ee4c5.pdf?index=trueIn PDF document text
    • https://7322f44d-5cb7-45f5-8521-a79093f6ce74.filesusr.com/ugd/dd0890_5300608b064c450c9df2efeba2f38c15.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8a6b719-d9d9-46c7-92a7-da45fa78a15f/boston_market_thanksgiving_dinner_cost_2020.pdfIn PDF document text
    • http://zukomakiduw.myartsonline.com/62048683420.pdfIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_fb2fa65fb83f4bd3b5822ac72b6b3aa7.pdf?index=trueIn PDF document text
    • https://df867d32-629d-4b48-af14-2fc5df20f827.filesusr.com/ugd/287761_2749b95be0b74eca88cae9133c424459.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8072d369-c585-4777-85f9-22933ccecf8c/jegixewolojusuxuwafe.pdfIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_2eca5c43828042d5bbd8851810d18eed.pdf?index=trueIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_f1032524af8247c8adc8ed9dcebb9c08.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_off0000e500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE500 5592 bytes
SHA-256: 19fbe3837495ff3fb606a1eb4c12a5dc8274e7b9203f57a38b9df0310c7a786b
font_01_sfnt_off0000f7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 9944 bytes
SHA-256: 16900c88e2fa924e51d591acea3d8167ff2796d1f617456a3eb654dcc9737ec9

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