Malicious PDF — malware analysis report

Static analysis result for SHA-256 b855825c5c2cdf3f…

MALICIOUS

PDF

68.1 KB Created: 2021-02-26 14:36:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f63659dab6b7bfb2d2655cabec3e4ba7 SHA-1: a29d6ddba9174144a79a5787cf4a489c7c597713 SHA-256: b855825c5c2cdf3f7038d73f3e491bb6612f29efc7c83601e1857ee60194f3f2
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 embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jottigo.ru/123?utm_term=harga+allen+heath+gl2400+32+channel PDF link annotation
    • http://filemarker.store/e_bikes_for_sale_at_walmartj1cqc.pdfIn PDF document text
    • http://widokig.iblogger.org/33510580757.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/ihTAigb/69706950063.pdfIn PDF document text
    • http://raisinsapp.club/cant_connect_to_jam_speaker3if2q.pdfIn PDF document text
    • http://rusakova.space/21053560186kmgjd.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/icjeawY/solar_smash_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/pagifizipafo/0Lhe7sz/kamimufijomejosiluku.pdfIn PDF document text
    • http://canonsburglake.com/cardboard_iron_man_glove_template2jk7t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453100/normal_602c3ef74ae98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475562/normal_602917c297aa3.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/lugodebobikubafijuponub.pdfIn PDF document text
    • https://cdn.sqhk.co/dakagugi/wRijge2/ludowici_ga_crime_rate.pdfIn PDF document text
    • http://inmyshtangen.xyz/slugfest_pinball_manualgvjau.pdfIn PDF document text
    • http://zikuwojanubeg.iblogger.org/ppt_timeline_templates_free.pdfIn PDF document text
    • http://lalashoppen.online/how_many_chapters_are_in_the_6th_harry_potter_bookxh3g8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413228/normal_6024c5df6f9ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://topadut.epizy.com/ct_scan_video.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_off0000cc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC47 5372 bytes
SHA-256: ea6d57e9be4f07743b2e6a040fcd2938e56e333b0888f74e2db184b73c966b59
font_01_sfnt_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 10948 bytes
SHA-256: e28f01d71b4b0d467641e56df7b09fbe98437f2274f8186bc29ce4fed3c3cb1f

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