Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4334e5c61bda791…

MALICIOUS

PDF

75.7 KB Created: 2021-05-18 16:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: aa1c8e7e816b6cb81568a03800c1bb96 SHA-1: 083dd257a6ccf8ff2e1ae20c1eae53530867d336 SHA-256: e4334e5c61bda79142713f957bffcf6c4cdbcedf6da0a1794058788374c7334d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF SEO Link Farm'. The primary malicious URL, 'https://vilenefex.ru/strik?utm_term=6+figures+in+6+months', suggests a lure related to financial gain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=6+figures+in+6+months PDF link annotation
    • https://zigamebujadosa.weebly.com/uploads/1/3/4/7/134745820/zegem_tolitesi.pdfIn PDF document text
    • https://fokereja.weebly.com/uploads/1/3/1/8/131856005/c10bf.pdfIn PDF document text
    • https://berekiba.weebly.com/uploads/1/3/1/4/131482976/rimipipigopepofobojo.pdfIn PDF document text
    • https://bujozimadepaxed.weebly.com/uploads/1/3/4/6/134615651/kesuw.pdfIn PDF document text
    • https://sawefewukiwow.weebly.com/uploads/1/3/1/4/131406412/mojalonaruzonosixefa.pdfIn PDF document text
    • https://forupiwiwipugo.weebly.com/uploads/1/3/5/3/135349306/03b7608aa94fe.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/4cf0b0f0f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/94d15e89-d395-4b84-b225-dc45013e9fd0/93798485571.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/fagivitu.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/brookhaven_high_school_band_performance_video.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/social_media_platforms_for_business_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/maya_borderlands_2_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/93242147572.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/how_to_make_garageband_songs_into_mp3_on_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a10c2d34-b17b-476e-bdff-228de27373d8/what_watt_speakers_do_i_need_for_a_party.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a8c16c9-efe6-43f6-9872-03abbd447e65/what_is_the_power_of_spoken_words.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/berserk_2017_batch_sub_indo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75e6b471-1e63-42de-bfc2-ef57db6212ba/3415968662.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/68376974191.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/vivujikuvog.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/38912002357.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/business_financial_spreadsheet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/47144352232.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_off0000e91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 5000 bytes
SHA-256: ab7a332d06f934bbd018c92ba6567b8f34c1dfac75bae73b2a8941749fedc3f2
font_01_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 11108 bytes
SHA-256: 8de04588c260694c28b99e5330f0a9b749d1a4196cf8428a44e94c224e1adbd0

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