Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0979d5ca2b0559d…

MALICIOUS

PDF

80.5 KB Created: 2021-03-23 08:00:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8c0287fe9c82b75eaa62d2cda95ec30f SHA-1: 55266f6e1a115449b555e6ac5f36d83d76119986 SHA-256: b0979d5ca2b0559d1f390eb046b134484039e2e68288d5463854edc30e3c0629
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/123?utm_term=can+i++minecraft+on+macbook+air PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372682/normal_603d2835b28ff.pdfIn PDF document text
    • https://monezoxikaxusoj.weebly.com/uploads/1/3/1/4/131453753/wuxavadakuma.pdfIn PDF document text
    • https://nakowubolitek.weebly.com/uploads/1/3/5/3/135349387/3548033.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/61193792393.pdfIn PDF document text
    • http://beststudent.space/54680616743rbcub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381098/normal_5fedcf8c95d96.pdfIn PDF document text
    • https://sumulepali.weebly.com/uploads/1/3/4/8/134882140/9510c9e2.pdfIn PDF document text
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/sakedupik.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/duzunixavemos.pdfIn PDF document text
    • http://cashtanks.fun/780988806934fkw8.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://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_c1ed05eb615745aba354b788bd2d9aaa.pdf?index=trueIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/guvajobonulara.pdfIn PDF document text
    • http://relivoziz.atwebpages.com/pujituwuvatumufanapu.pdfIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/60057302751.pdfIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_5f200e64b1c440b0b842f119510805b6.pdf?index=trueIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_071e16be1eb041fbb7530acf8e54d148.pdf?index=trueIn PDF document text
    • http://kexomun.myartsonline.com/zesejufajajepedov.pdfIn PDF document text
    • https://66f9544f-8325-470d-a543-c07714603334.filesusr.com/ugd/4b2642_6f302693097340838bd273c74b142e7e.pdf?index=trueIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_7e1eb179d2c6403788ad628cec5f9474.pdf?index=trueIn PDF document text
    • https://10bc5e17-7652-4c7e-9b43-999b3eb3b021.filesusr.com/ugd/5edc69_15c191e2b8654f3282cb92172955651e.pdf?index=trueIn PDF document text
    • https://d798de41-6847-46d1-b877-4f1b84f556ee.filesusr.com/ugd/3e315c_becd328f30d74a76bd31c7dbd27eca88.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 4832 bytes
SHA-256: 56ee24edd509e8f8eb9fa19d13c9cd046371f95e663db81c37da1c13c7f5c55e
font_01_sfnt_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 11352 bytes
SHA-256: 25ca04b094ab32764945a943da59ed3fa44c0b1edfb8882dae8808b84191a4df
font_02_sfnt_off0001268b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268B 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71