Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3605fe98bce84f…

MALICIOUS

PDF

78.8 KB Created: 2021-05-08 06:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b779c702672e788e3120f13e99427450 SHA-1: d67d1a60b57545cca4249c8b360dc68ac90a285a SHA-256: ff3605fe98bce84fc51b3cd62b0dd576e201368f6a64948c2c332da3633abb33
186 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 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/strik?utm_term=cuisinart+12+cup+programmable+coffee+maker PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408851/normal_6049bdc27b1f1.pdfIn PDF document text
    • https://cdn.sqhk.co/jututumogu/RgiajhE/rafokokuxewo.pdfIn PDF document text
    • https://sefaxamijewosaw.weebly.com/uploads/1/3/2/6/132682716/3470319.pdfIn PDF document text
    • http://mosilosa.iblogger.org/best_baby_names_book_2020.pdfIn PDF document text
    • http://fibipug.22web.org/samsung_syncmaster_2033_refresh_rate.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/hdfGgjo/69812767776.pdfIn PDF document text
    • https://cdn.sqhk.co/dojarodawiw/evigghC/kiluwuxolidulidejabosomu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425910/normal_606da2e580394.pdfIn PDF document text
    • https://xemilesexevig.weebly.com/uploads/1/3/4/2/134266110/butoninuki_javenimutiligo_xepanos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450336/normal_6042c30e43122.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/g4igib5/72876810670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495251/normal_6015eb475adfe.pdfIn PDF document text
    • https://cdn.sqhk.co/jibezilesu/eAiieOe/retrograde_motion_definition_example.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://tituroxir.rf.gd/ansible_template_j2_variables.pdfIn PDF document text
    • http://jobubiro.epizy.com/vowedigefufumemadazukuse.pdfIn PDF document text
    • http://zenujasope.epizy.com/bielsa_formation_leeds.pdfIn PDF document text
    • http://vowipinarofesax.epizy.com/best_motorcycle_accessories_shop_near_me.pdfIn PDF document text
    • http://makidibe.epizy.com/angular_6_file_button.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_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 5628 bytes
SHA-256: da7fc8c3718e326b971a5c5fc77e2c86971052eaf6de3525bb3121661a7472d1
font_01_sfnt_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 10956 bytes
SHA-256: 7ef4a083830b58ecce3b48c13da55edbc04cc1cbc02cc5fa92e287891729e1d6
font_02_sfnt_off00011d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D61 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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