Malicious PDF — malware analysis report

Static analysis result for SHA-256 773022465c2bfe45…

MALICIOUS

PDF

81.6 KB Created: 2021-03-18 16:03:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0b69ebdbe9c185e2e7a13b320ce5a19c SHA-1: b0d20cb4dbb6cb0157a95645e7911e6b63a9ed5f SHA-256: 773022465c2bfe450d855746686cd504de8d11f72c54025399c0bfafe8a6d41e
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 external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded content, though heavily obfuscated, suggests the use of JavaScript for executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=jeep+cherokee+problems PDF link annotation
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/vatuxeliraje_jikipuvowutajef.pdfIn PDF document text
    • https://pimujupaz.weebly.com/uploads/1/3/4/4/134440235/5069188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_602069c3358e2.pdfIn PDF document text
    • http://kopalirigel.mypressonline.com/bimumobirunetomuveka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450147/normal_5ff30e9146339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491437/normal_602f8c708f874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466370/normal_603a04549c4b6.pdfIn PDF document text
    • https://verakolor.weebly.com/uploads/1/3/1/3/131379730/d087de.pdfIn PDF document text
    • https://rizigavitud.weebly.com/uploads/1/3/4/5/134581125/3437277.pdfIn PDF document text
    • https://gujojiri.weebly.com/uploads/1/3/4/4/134434224/802f4c.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/eafc643f-941e-4c5d-aff9-9f3950e882e1/98963756437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f79c97-457a-4432-86f4-c2ed7c8be8b2/jitterbug_phone_plans_walmart.pdfIn PDF document text
    • http://jogisav.epizy.com/volkswagen_polo_repair_manual.pdfIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_15a5ac563825428e9afd49ccbaba1045.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c077cef4-e8ae-43ed-a582-f014691c0bf5/wexoruno.pdfIn PDF document text
    • http://zelogano.epizy.com/nupolujisak.pdfIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_348d957e7ffb4cd6946e83a8b60a92af.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_38eb64a9019d40e095a9f0c44a061b9b.pdf?index=trueIn PDF document text
    • http://juludiripo.myartsonline.com/konosuba_light_novel_volume_17_vietsub.pdfIn PDF document text
    • http://koburolamugalo.rf.gd/los_albigenses_maturin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd2da10-1154-400b-9a94-8b4f750f1ce7/mozonibefu.pdfIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_c4688cbbf27d45018de62ecf7bfd8d59.pdf?index=trueIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_5087c7dd035d4d11b97856573af2ccdd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72639e9f-2b78-4d4a-a57c-5232893ab15b/42955126328.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_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 4712 bytes
SHA-256: ec5b759db6fb257b66a790c47d697896f338f69eed516a9f7afd356348687e7a
font_01_sfnt_off000104fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FA 11116 bytes
SHA-256: 081f1c97264849cf3871e4f84b2e528c0a9549ce2c3e894a08e7bd0ef001d7d6
font_02_sfnt_off00012ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD4 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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