Malicious PDF — malware analysis report

Static analysis result for SHA-256 34969f954dc288ff…

MALICIOUS

PDF

63.9 KB Created: 2021-02-15 12:45:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8b51e7817c2cc2565f2e5ce24a069a53 SHA-1: 3c9f30547045587c8c4a36a89ccf138bff48a254 SHA-256: 34969f954dc288ffc9d54e07dff84a4d980c9cf9dac1308a546b54b836d2aa79
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging T1059.007 (JavaScript) for its malicious functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jacksth.ru/123?utm_term=hotpoint+gas+oven+operating+instructions PDF link annotation
    • https://cdn.sqhk.co/dofexoxev/h0jdhh4/play_galaxy_attack_alien_shooter_on_pc.pdfIn PDF document text
    • https://wazexexa.weebly.com/uploads/1/3/5/3/135305699/5abeee.pdfIn PDF document text
    • http://good-production11.site/pirates_of_the_caribbean_easy_piano_sheet_music_freefhtgs.pdfIn PDF document text
    • https://cdn.sqhk.co/nuponoviva/gcbIThj/omniglot_thai_alphabet.pdfIn PDF document text
    • https://wedodoto.weebly.com/uploads/1/3/5/9/135993452/nubipujogibeseros.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423696/normal_60208dcdae70a.pdfIn PDF document text
    • http://mabay.fun/14645435914kwe5o.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/darekejoxazabebuziso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366351/normal_5fc8456baed97.pdfIn PDF document text
    • https://cdn.sqhk.co/dusimefosix/YcBgg9o/pujotesepabekefej.pdfIn PDF document text
    • http://glossywp.online/ribadesutiwodl02hb.pdfIn PDF document text
    • http://veletekuti.66ghz.com/archon_android_emulator_system_requirements.pdfIn PDF document text
    • http://gebajajax.22web.org/a_whole_new_world_flute_music_sheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370097/normal_5fca6ab69c25c.pdfIn PDF document text
    • https://zerivomixiloz.weebly.com/uploads/1/3/4/6/134664353/491192.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://zobovobewuw.epizy.com/comreg_annual_report.pdfIn PDF document text
    • http://wavudipikudela.epizy.com/18277328411.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_off0000b39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39F 4972 bytes
SHA-256: c7231ad73d21154fefb0786976025a46378f6e12f738ef2218f8431204abb6d0
font_01_sfnt_off0000c495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC495 9260 bytes
SHA-256: ebe644f2d29e536817518b058947fb36d4779d0eb2ca9c3ec5222f6a0be3629a
font_02_sfnt_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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