Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f2aa9de3b7ef49…

MALICIOUS

PDF

74.2 KB Created: 2021-02-21 14:34:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5e2370549b8b6b4dd137b3591d0b5786 SHA-1: 25e5e93b3abd943af5059b1b735aa00d1861bf2b SHA-256: a7f2aa9de3b7ef4975818c3c262db72a96332e15f28741b9e495d300d167006e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://druttle.ru/strik?utm_term=the+five+elements+of+effective+thinking+audiobook', suggests a lure related to an audiobook. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=the+five+elements+of+effective+thinking+audiobook PDF link annotation
    • https://natadafupekex.weebly.com/uploads/1/3/1/8/131856288/zopatefibav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365998/normal_5ff114f88471a.pdfIn PDF document text
    • https://nitevafatuva.weebly.com/uploads/1/3/4/8/134872456/11fdaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465133/normal_5ff4a31ac8619.pdfIn PDF document text
    • https://rasozonikazip.weebly.com/uploads/1/3/4/9/134904665/lumorazizepubux-sevujelawebegas.pdfIn PDF document text
    • http://wupupetobuzune.22web.org/67345019811.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
    • http://zozinidusekoz.epizy.com/ruwafimijavelanorilafapo.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/xijepukegajomadewo.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/dc_voters_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/10328973462.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/example_coliform_bacteria_definition.pdfIn PDF document text
    • http://xulufavuso.rf.gd/baghban_full_movie_free.pdfIn PDF document text
    • http://vezoxonu.epizy.com/jirut.pdfIn PDF document text
    • http://ximagutetala.epizy.com/difficult_airway_society_extubation_guidelines_group.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_off0000d76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76A 5432 bytes
SHA-256: 0d25c3bde404bccad03816e3e8db3d6a896bebd77988865f00c7508cb0cde6e1
font_01_sfnt_off0000e9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 10372 bytes
SHA-256: 00125dd42f841a525dec9302cf25052875bbdc8127c15c3c65f540cbf56c98cd
font_02_sfnt_off00010d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D18 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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