Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0f91afa2d68500…

MALICIOUS

PDF

88.6 KB Created: 2021-03-16 02:53:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0efe7ac70aba32aaf216aa867cd08ba3 SHA-1: 719dbe0425fb84e17781a296eae0752744c1eec1 SHA-256: 0b0f91afa2d6850053e04640e6cbeccd5dc62a35ea33664a4742874c87572432
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a notable heuristic identifying it as a link farm on disposable hosting, pointing to suspicious domains like 'soxebez.ru' and 'cg-designer.xyz'. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm and potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://soxebez.ru/strik?utm_term=hush+hush+sweet+charlotte+movie+cast PDF link annotation
    • http://cg-designer.xyz/zamodamewuluwge623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500670/normal_601a44f56d3de.pdfIn PDF document text
    • https://cdn.sqhk.co/ramowejub/b3Vidgd/57012293686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465397/normal_602b727cb7a14.pdfIn PDF document text
    • https://cdn.sqhk.co/gujipiror/e6yhjjf/zifomifelegemezon.pdfIn PDF document text
    • https://cdn.sqhk.co/fibapezo/fXjihet/43522502611.pdfIn PDF document text
    • http://allerlo.xyz/what_is_the_best_real_christmas_tree_to_havefzxzd.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/YJsheT5/friedman_test_excel_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460043/normal_604322be1301b.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/m91thha/28479812583.pdfIn PDF document text
    • http://keepxufi.space/nipuzifokuwiweterefoz6h5rr.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/Fidjfhe/most_popular_tiktok_songs_april_2020.pdfIn PDF document text
    • http://pc-remont.website/the_raven_queen_5ebaws3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408712/normal_5ffdef5872e4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412183/normal_5ff3eca0c71c2.pdfIn PDF document text
    • http://shop-onlinediscount.xyz/50616663112azet3.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/EjdHiaH/solo_launcher_apk_old_version.pdfIn PDF document text
    • https://cdn.sqhk.co/ketofebem/UfrogdP/segerivexerabired.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
    • https://uploads.strikinglycdn.com/files/abbc9107-395f-4cb1-8deb-11193e13af6d/how_to_reset_sky_mini_box.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/rimusiporibigirizevur.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/joomla_templates_free_responsive_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/dalibukalesatimaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/080b734b-b41e-4db4-a4a6-fa17403f093f/coaching_psychology_manual_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/the_standard_hotel_los_angeles_parking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d0b2a5a-26e5-4f4a-900b-f4d1d1435014/walul.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/bruises_delta_jack_remix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/422b8f43-4dad-4cf0-8104-f53a70342bdc/toro_timecutter_z4200_service_manual.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_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 4928 bytes
SHA-256: e5c1c3bf447c6522466f74d6f7645e2bcae63c8310f28f18206ed324791f8531
font_01_sfnt_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 11316 bytes
SHA-256: df6faff724a8dd5cbfbfe20879b39b5a17c5d4bee9fd57e62828b38cab981fdc
font_02_sfnt_off000145d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D1 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361