Malicious PDF — malware analysis report

Static analysis result for SHA-256 a013cced62c90e63…

MALICIOUS

PDF

90.2 KB Created: 2021-03-17 06:45:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bac465bb33eb532e809633893371c05a SHA-1: 8d16b17482ca4f7b2707238ed85545ec9e1a80ef SHA-256: a013cced62c90e6336ccba5673115197613386b10de778fecbfff75de2ab8cb1
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 0.9997

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://ponafet.ru/123?utm_term=du+msc+mathematics+entrance+syllabus+pdf PDF link annotation
    • https://pawawejovotete.weebly.com/uploads/1/3/2/8/132814611/7ab1d.pdfIn PDF document text
    • https://cdn.sqhk.co/morureju/l9Rjcjg/10169045234.pdfIn PDF document text
    • https://sasozubavurak.weebly.com/uploads/1/3/4/8/134886198/ganijasamapexitam.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/ibS6rOH/lubuvuvupaxuvonifelijeg.pdfIn PDF document text
    • https://cdn.sqhk.co/gefizorabubi/gjZ7ef0/juvigozusawuj.pdfIn PDF document text
    • https://juzudibat.weebly.com/uploads/1/3/4/3/134328144/sixesadosajaseleto.pdfIn PDF document text
    • https://cdn.sqhk.co/pejozujemu/9jj3psF/nafol.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluwumenad/OJh9eib/yemen_civil_war_map_template.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ropuba/line_graph_google_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f897855-68a7-4fd6-b183-becbccfb1795/67617620187.pdfIn PDF document text
    • http://lagimamarujuzof.epizy.com/bekuvomimuditiwi.pdfIn PDF document text
    • http://favuzokusom.rf.gd/gujowuferikewinusetato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b68d4aa-3d02-4187-acfe-f3523dd4c018/matlab_plot3_color_line.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc0bf07-a5cf-4da4-990f-f953b2804426/digimon_world_3_training_spots.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/missouri_boating_license_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/zorelen.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/el_arte_de_amar_ovidio.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_off00011a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A57 1644 bytes
SHA-256: 2b05a3adb112a40af8bae0cae56046f773a95dfeb999eab1f5bb2d06a31f91c1
font_01_sfnt_off00012285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12285 5636 bytes
SHA-256: 8a2e7e76058b38ebccf99c35539f363ddc0561765442d97b266edd3c90860a68
font_02_sfnt_off0001358b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358B 11036 bytes
SHA-256: 8676ed70a76b5fb1aa90d625d434d5a9bcd5d9b2caf11998f8510dcdf45253b2

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