Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a96e43a7a88f904…

MALICIOUS

PDF

48.0 KB Created: 2020-11-08 12:03:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bc691f2f17903278fe94b597487730cd SHA-1: 25f3b7f1ac564c0d2ce41a3a476f3de034324273 SHA-256: 3a96e43a7a88f90472a8621359d54ab2041fb891791ca8f8bfc59d4fa55118a0
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 1.0000

Heuristics 4

  • 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.
  • 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://trafffe.ru/123?keyword=kbd+osrs+guide PDF link annotation
    • https://tuzuwopibas.weebly.com/uploads/1/3/4/3/134316447/nedom.pdfIn PDF document text
    • https://jikuvagipotax.weebly.com/uploads/1/3/4/6/134647272/sinetafefo.pdfIn PDF document text
    • https://buwupejobo.weebly.com/uploads/1/3/4/2/134265589/6344243.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/0d0b2c13be1.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/juradup.pdfIn PDF document text
    • https://degitigurot.weebly.com/uploads/1/3/4/3/134337886/xavabet_bepeze_nibudifedin.pdfIn PDF document text
    • https://zejibafubetu.weebly.com/uploads/1/3/4/1/134108860/5985892.pdfIn PDF document text
    • https://wipaluxeko.weebly.com/uploads/1/3/4/3/134346688/3802243.pdfIn PDF document text
    • https://kexoxuneve.weebly.com/uploads/1/3/4/5/134501441/zowiwagoz.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://vesorezi.files.wordpress.com/2020/11/andrews_study_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/nesupidimigijinumu.pdfIn PDF document text
    • https://debulavoj.files.wordpress.com/2020/11/50879636268.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/85122700852.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/8606137057.pdfIn PDF document text
    • https://segokaguwun.files.wordpress.com/2020/11/fuzoxesageruvorokikotur.pdfIn PDF document text
    • https://s3.amazonaws.com/vopadofugon/vasapoxiwefifixexixo.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_off00007122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7122 4556 bytes
SHA-256: 69e43a62e429a808a720f5e4a47fdd826946a34935d2e3504c41006f7a5e96d8
font_01_sfnt_off000080a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80A5 10744 bytes
SHA-256: 4a146400668116acbdf64f8340d4e160a26b46a190f46224cac0a9b7928f8a66
font_02_sfnt_off0000a551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA551 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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