Malicious PDF — malware analysis report

Static analysis result for SHA-256 b693e1883080ffa1…

MALICIOUS

PDF

84.3 KB Created: 2021-01-19 17:38:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: fd54c6affc89ef398ab0cfdc788905b5 SHA-1: 61f632a160a6204b6143e0569d2734acc2aecb75 SHA-256: b693e1883080ffa1121241d83e5e26844c751da8e92176f34fec9de86de5c9cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

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://traffset.ru/aws?utm_term=attitude+and+behaviour+pdf PDF link annotation
    • https://cdn.sqhk.co/letijefa/ifjc6gj/65556701026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_5fb48bb69b9fa.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/hhSt3dl/75614538751.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505837/normal_5ff04ca5d3a8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407303/normal_5fc8e43166281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f8d5907e36ac.pdfIn PDF document text
    • https://site-1166625.mozfiles.com/files/1166625/babasomizebetonoka.pdfIn PDF document text
    • https://site-1168264.mozfiles.com/files/1168264/can_you_escape_the_room_8_level_42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452389/normal_5fc65cfe8f8db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384152/normal_5fa0d206e2039.pdfIn PDF document text
    • http://lusoxokurutugap.22web.org/good_morning_photos_hd_gif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jatuxijor.epizy.com/63828677260.pdfIn PDF document text
    • http://mevomum.epizy.com/guideline_warfarin_monitoring.pdfIn PDF document text
    • http://kosener.epizy.com/californian_fb_font_for_mac.pdfIn PDF document text
    • http://samowegepor.rf.gd/assoluto_racing_apk_mod_revdl.pdfIn PDF document text
    • http://bopuxenuxesozu.rf.gd/latest_bhojpuri_video_song_2019.pdfIn PDF document text
    • http://xugomoxuniwemo.rf.gd/24414153265.pdfIn PDF document text
    • http://delenujafoxa.rf.gd/frago_template_usmc.pdfIn PDF document text
    • http://fozovevozasox.epizy.com/12669372575.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_off00010f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F22 5108 bytes
SHA-256: 148a709310596d42407bce7a24f5b4e4c57436a22e0de735926f0fa0297da916
font_01_sfnt_off0001207f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207F 10356 bytes
SHA-256: 992f10461a438513d03e892f2efe3744c1ad967fea78f3fa10e464efb9cc92b9

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