Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4a93ee83643b9d…

MALICIOUS

PDF

77.9 KB Created: 2021-02-24 01:36:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 45c467e7e3c60a9a31e83649e14969ed SHA-1: 0f4e1b34e6a778ad3bb079759db3ac79224702de SHA-256: ab4a93ee83643b9dfa240ef4c2104bc768b75c04c9ee92b9d9c16cfd47ce9b08
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm and ClamAV detection as a phishing trojan. The presence of numerous external links, many pointing to suspicious domains, indicates a malicious intent to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/aws?utm_term=how+to+grant+writing PDF link annotation
    • http://eeuuurrrrr.space/advantages_of_internet_filetyhpy.pdfIn PDF document text
    • https://tadizusojad.weebly.com/uploads/1/3/2/7/132712436/somekozaxuvex.pdfIn PDF document text
    • https://zotepuzexalebox.weebly.com/uploads/1/3/5/3/135397030/vakenexagoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468537/normal_600062a16ca22.pdfIn PDF document text
    • https://takojozosuliwo.weebly.com/uploads/1/3/0/7/130739597/rixevuzazab.pdfIn PDF document text
    • https://peniwifagupe.weebly.com/uploads/1/3/0/7/130738894/7937026.pdfIn PDF document text
    • https://wajigigo.weebly.com/uploads/1/3/4/5/134588105/tirusalarime_memokes.pdfIn PDF document text
    • http://repaircreditscore.info/lolitg2sar.pdfIn PDF document text
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/7553295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419204/normal_600cde7257606.pdfIn PDF document text
    • http://recepty-dd.info/40146381498pqqp0.pdfIn PDF document text
    • https://nejavolezi.weebly.com/uploads/1/3/4/0/134017816/roremotagejasas-wimevu.pdfIn PDF document text
    • https://tunuwadubozowe.weebly.com/uploads/1/3/4/3/134363043/dovonoriligob-pebukorusuwotob-noforizenoled.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/solonebosop/back_wars_mod_apk_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/fagivitu.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/powow.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/learning_drawing_and_painting.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_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 4696 bytes
SHA-256: 2e78ded83d59aacf9e21757a58c659567223a4bf58b52b9fb3bcf44521df2864
font_01_sfnt_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 10980 bytes
SHA-256: ebddf8559a1dcf24de76c7f54af5f3b7ad6d06535318575014947a8b0b79d54f

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