Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c13c9d3d47eca7…

MALICIOUS

PDF

82.2 KB Created: 2021-03-23 17:25:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 65194749df60aef32cf13b3ec8b54b83 SHA-1: 59612b978fc310dd0e275d0bd252aa83bde845ef SHA-256: a6c13c9d3d47eca7c7f8076c446a37b6bdc7080513398531689180f9e68524c3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://vilenefex.ru/strik?utm_term=asus+rt-ac68u+firmware+restoration+utility PDF link annotation
    • http://train-home.ru/burum6vwwn.pdfIn PDF document text
    • https://latoratepowubum.weebly.com/uploads/1/3/4/7/134713938/gikemipimif-befoguzoj.pdfIn PDF document text
    • http://vinograd.io/kenmore_elite_he3_washer_cleaning_cycle6ssam.pdfIn PDF document text
    • http://mkr-olimp.info/mirchi_telugu_1080p_hd_video_songsl5dld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443292/normal_60498618d5a70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_604b99ec59e0e.pdfIn PDF document text
    • http://ranupila.mywebcommunity.org/antihypertensive_drugs_in_pregnancy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462362/normal_6007c5df3b50c.pdfIn PDF document text
    • http://cocobeautybar.ca/honda_shadow_1100_carb_adjustmenthzia8.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/4012663.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482629/normal_5fc6a0d974c42.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/lorifumofelu/how_many_chapters_in_allegiant_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/94185879254.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/wapoterexezawabofu.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/30595156496.pdfIn PDF document text
    • http://zevusup.atwebpages.com/esl_pre_intermediate_reading_comprehension_worksheets.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 2960 bytes
SHA-256: 9e8301a812e0963997f2c69c75bfd39e7fcc44359b8a43baf6657440e065e79d
font_01_sfnt_off0000ed19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 5592 bytes
SHA-256: 4d0dbb383635f6e7a4a438408f02580e6629819459959ffd6e7197abaa8a0e03
font_02_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 11016 bytes
SHA-256: e471f9c06f64cb8414c0916b3d6b527c253ccd9f3d6dd60a53dbc80ebb1d44c5
font_03_sfnt_off000125f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F1 16160 bytes
SHA-256: 25a5e6c7c9cd73e1730f271d334b71b3c0ac6385951e3737251623a68d8eef5c

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