Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72d43802023bb3c…

MALICIOUS

PDF

87.2 KB Created: 2021-02-27 06:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a0465fde3008362c57bc3743be6cbf35 SHA-1: 3bcf6cc4d5e80dc39518d1a6d0d67d9b22fdb5a8 SHA-256: a72d43802023bb3c351b7ee0ee72a3b929d372aa10308b28d162edbb53d3e77b
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 0.9998

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/123?utm_term=que+tienen+en+comun+la+narradora+y+tita PDF link annotation
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/6253426.pdfIn PDF document text
    • http://wikowezenitezo.medianewsonline.com/51890385728.pdfIn PDF document text
    • https://ditoleruv.weebly.com/uploads/1/3/5/3/135345680/vivirula-pajipo.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/3210661686.pdfIn PDF document text
    • https://witojezig.weebly.com/uploads/1/3/0/7/130776148/buvujolovo-dotigegidezebu-jomukuza-dogimiwonidofu.pdfIn PDF document text
    • https://kesiwupi.weebly.com/uploads/1/3/1/4/131407351/4800454.pdfIn PDF document text
    • https://zobanegasub.weebly.com/uploads/1/3/1/1/131164549/5915445.pdfIn PDF document text
    • https://jesofoxera.weebly.com/uploads/1/3/1/4/131407857/2473422.pdfIn PDF document text
    • https://jososipiwudamuw.weebly.com/uploads/1/3/2/7/132740918/wofedavosokozes_xovubomeras_tinabirojor_rovubufi.pdfIn PDF document text
    • https://bubunixijasebed.weebly.com/uploads/1/3/1/4/131407035/misanamad.pdfIn PDF document text
    • https://pedidifapa.weebly.com/uploads/1/3/0/8/130874671/ebe1ac.pdfIn PDF document text
    • http://sutovuresas.mygamesonline.org/yard_machine_lawn_mower_550ex_oil.pdfIn PDF document text
    • https://viwosexoteb.weebly.com/uploads/1/3/4/6/134631328/tavizadogogez-zifuxezawowi-givufofune.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nonosolagosev.epizy.com/9859104439.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/34574700941.pdfIn PDF document text
    • http://pogifovemujure.epizy.com/dumivatosavekukomokot.pdfIn PDF document text
    • http://sufumawug.epizy.com/sight_words_grade_1_worksheets.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/wobarofosixu.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_off00010f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 5068 bytes
SHA-256: 6478985d721d217ef6d308d5b01cd8589bf535d55cd27410e795a4dc5e5bfe69
font_01_sfnt_off0001205d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205D 14852 bytes
SHA-256: 6260df6c491a731004cc8fa5b231e5d12c515292594f95ae8ebdaaccbc364f89

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