Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd129aeed6df383…

MALICIOUS

PDF

74.2 KB Created: 2021-02-01 00:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9ab829fc69e41cea880262890ea68bbf SHA-1: 37df048be65150ecfd9d00a790d705242a48e9ce SHA-256: 7dd129aeed6df383c11e0c7542004010486ecab6d98165d3ca6afa4d62a1d788
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating it is part of a link farm designed to generate traffic or distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious campaign.

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/aws?utm_term=easter+worksheets+for+kindergarten+esl PDF link annotation
    • http://wofoweniwer.iblogger.org/normal_pressure_hydrocephalus_treatment_guidelines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413976/normal_6000cfe154d4e.pdfIn PDF document text
    • https://jetorijeroxu.weebly.com/uploads/1/3/4/6/134693882/c1c31708c2b5d.pdfIn PDF document text
    • https://libotavod.weebly.com/uploads/1/3/0/8/130813055/3024255.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379723/normal_5fc8d57c30e18.pdfIn PDF document text
    • https://derigogo.weebly.com/uploads/1/3/4/0/134017063/8774798.pdfIn PDF document text
    • https://sixikubirosepup.weebly.com/uploads/1/3/3/9/133997641/memami-sevepusutub-pizojosodezaz.pdfIn PDF document text
    • https://kamedewogivazu.weebly.com/uploads/1/3/4/0/134096977/aac4967f07e.pdfIn PDF document text
    • https://nalafefig.weebly.com/uploads/1/3/1/3/131379301/fetut.pdfIn PDF document text
    • https://sojuseruk.weebly.com/uploads/1/3/4/3/134367588/5190052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383702/normal_600ef522e02d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383929/normal_60104ba3284e3.pdfIn PDF document text
    • http://guvizaw.22web.org/ordering_non_consecutive_numbers_worksheet.pdfIn PDF document text
    • https://rovibabewovel.weebly.com/uploads/1/3/4/8/134884015/wijatuzerewabupani.pdfIn PDF document text
    • https://zuripiri.weebly.com/uploads/1/3/1/8/131856797/5211981.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486033/normal_5fe2c3daf362b.pdfIn PDF document text
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/b576d71b19.pdfIn PDF document text
    • https://sezavifibeka.weebly.com/uploads/1/3/4/4/134463458/kelojowupirovi.pdfIn PDF document text
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/todumedo_ribowevoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pumonufagatoteb.epizy.com/82828562040.pdfIn PDF document text
    • http://bumevibil.epizy.com/menagerie_weapons_and_armor_guide.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_off0000e392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE392 5284 bytes
SHA-256: e2dc7ec8bac61f631d081e8c4737918b5b640de865607a7eed2220ffea58f115
font_01_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 10504 bytes
SHA-256: 8e414d5f8730fedc5fc33d946dba8c6430207008f93c09b578e87bb9bb479fc6