Malicious PDF — malware analysis report

Static analysis result for SHA-256 7477cebbf0cb8c06…

MALICIOUS

PDF

77.9 KB Created: 2021-03-16 04:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0dee83811903c3ec6050cda4a029c25 SHA-1: 231e1841fac6cf81752f9712ded919e3381a26ad SHA-256: 7477cebbf0cb8c06227b09fc7efeb0560be5405e1f923ff5c948d34097c42cbe
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 of which are hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://ponafet.ru/123?utm_term=minecraft++for+windows+7+professional', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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 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://ponafet.ru/123?utm_term=minecraft++for+windows+7+professional
    • https://cdn-cms.f-static.net/uploads/4463266/normal_600f10d7c4ecb.pdf
    • https://static.s123-cdn-static.com/uploads/4419191/normal_5feb56f488e95.pdf
    • http://jamotovoxut.mywebcommunity.org/atrial_fibrillation_guidelines_2020.pdf
    • https://jovigazever.weebly.com/uploads/1/3/1/6/131637362/mizedozaruduparaweja.pdf
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/fegare.pdf
    • https://tokawokemiw.weebly.com/uploads/1/3/4/7/134730305/lowenonatu_gezomofu.pdf
    • http://nerixobetevo.iblogger.org/wumimivodo.pdf
    • https://megularebenava.weebly.com/uploads/1/3/1/1/131164421/xuvulujubuw.pdf
    • https://vugawijop.weebly.com/uploads/1/3/4/5/134594760/62d3c6.pdf
    • https://cdn-cms.f-static.net/uploads/4373511/normal_602584b5ca0f5.pdf
    • https://sipinawuzukefo.weebly.com/uploads/1/3/1/4/131410227/2916274.pdf
    • https://morogixifidogaj.weebly.com/uploads/1/3/4/4/134497599/736376.pdf
    • https://riguniliwegab.weebly.com/uploads/1/3/5/3/135342973/pijufenova.pdf
    • https://dituvilabo.weebly.com/uploads/1/3/4/8/134897320/d56fbc.pdf
    • https://worojipe.weebly.com/uploads/1/3/1/3/131382243/2992596.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_f2c3f9dcf1564f1db8bbcaff6effad37.pdf?index=true
    • http://davojuke.epizy.com/lupabagulaguwi.pdf
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_d63ad747ea6248eab6faf018625335b6.pdf?index=true
    • http://livirava.atwebpages.com/patirekivudel.pdf
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_f039bf4805bc466fa7a355bcc26bfd0e.pdf?index=true
    • http://jigisasamupor.onlinewebshop.net/44095884638.pdf
    • http://popofisofol.myartsonline.com/d_d_blank_character_sheet.pdf
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_d0d235160d46402299e4eae7f60fe589.pdf?index=true
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_2119918f8e81468c8aeb5f9677b6bcf9.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed83.bin
94553dde297f1000b638cb6d6fd987918135cbbc7a68548c456733f4d4995740		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 5328 bytes
font_01_sfnt_off0000ffdb.bin
4a94c90bfca1f181261cf6ccf22f016d073ef8da9e3b166bb177f210e79e38ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 12916 bytes

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