Malicious PDF — malware analysis report

Static analysis result for SHA-256 f107fdf7c563c3c8…

MALICIOUS

PDF

76.7 KB Created: 2021-03-19 13:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6b0db527a37af985d0af1e9d9130a939 SHA-1: 33ac402151c96c2db21398381bfa00214339aa55 SHA-256: f107fdf7c563c3c88a7b51898e9d2b4237cd5258e74bc2e66c0496fb6581e4ab
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-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://baarspo.ru/award?keyword=nomenclatura+de+alcanos+ejercicios+pdf PDF link annotation
    • https://kasitawudak.weebly.com/uploads/1/3/1/3/131380619/sifaputes_nabuvidomibomab_gamamoxusijowi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458628/normal_5fc8293333901.pdfIn PDF document text
    • https://likimipezerejo.weebly.com/uploads/1/3/2/6/132682052/wokavuwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379722/normal_5ff56dfac593b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459776/normal_602e31413a887.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452199/normal_5fdf2c9d35dba.pdfIn PDF document text
    • http://sirosin.iblogger.org/john_mcgrath_a_good_night_out.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484122/normal_6041e030cd9b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384048/normal_60488fed0f349.pdfIn PDF document text
    • https://cdn.sqhk.co/nozujeraguje/4hbijjj/download_alien_zone_plus_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366354/normal_5fcf3995836aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418001/normal_605438237b51a.pdfIn PDF document text
    • https://kuvenamowafave.weebly.com/uploads/1/3/1/3/131379608/vusakigexi.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/fuMIhhh/super_penguin_league_3_thaisub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447084/normal_5fc6ff751a6f6.pdfIn PDF document text
    • https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/gikititaro.pdfIn PDF document text
    • http://mikakovakoj.iblogger.org/zonojogalowopusej.pdfIn PDF document text
    • https://satufimitu.weebly.com/uploads/1/3/4/7/134715308/5096674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420037/normal_60121d1be85e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_602090dbdaafb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420747/normal_60400da31990e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://momubitirukoj.rf.gd/how_do_you_cook_waffles_in_a_waffle_maker.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_off0000ee49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE49 5348 bytes
SHA-256: 879c45ec499552ffe21cddc11318e14fd3b01f9be03df091132d038fc7dada0f
font_01_sfnt_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 10756 bytes
SHA-256: 33d63f39042f7b8095ca5d91e9ddcaf3d5a8a04577108026e85ea61938c03dd4

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