Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc6aaa092c87683…

MALICIOUS

PDF

71.6 KB Created: 2021-02-07 07:37:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4a4a81f3d138ccfe38e072d8e84b6618 SHA-1: 086b5ad853dcfab6b4eaa5584aa71540933e5a5e SHA-256: 3fc6aaa092c876830d3f2f1cc83744bccd2f5e226cadc42635093dfbb3cf17b7
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. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to disposable hosting. The primary malicious URL identified is https://jottigo.ru/aws?utm_term=uniform+disc+position+allocator+ns3, which is likely used to host or redirect to a malicious payload.

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/aws?utm_term=uniform+disc+position+allocator+ns3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466175/normal_5ff28176567aa.pdfIn PDF document text
    • http://nazawate.iblogger.org/16637365791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465938/normal_600b112b2c8c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482027/normal_601c600ebc8d1.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/hcdWHia/texas_longhorns_basketball_ncaa_tournament.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471475/normal_5ff4b5b843850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418764/normal_601336437a945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_5fd0f51c4a266.pdfIn PDF document text
    • https://cdn.sqhk.co/badiboxa/ghajhey/dragalia_lost_tier_list_september_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490523/normal_60116d6cb19fb.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzufoxo/heJicGg/5574757472.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vonolukover.epizy.com/sodium_formaldehyde_bisulphite_msds.pdfIn PDF document text
    • http://dogirajuwuxo.epizy.com/wuxepusetomifavefew.pdfIn PDF document text
    • http://rosukijabadizi.epizy.com/audio_visual_video_maker_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/girl_guide_brownie_promise.pdfIn PDF document text
    • http://matezule.rf.gd/beard_man_whatsapp_status_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_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 5456 bytes
SHA-256: 10c8fb30d41456270ecc58be1892e1e1b617e9d8679b1d0ce64764d615ab6713
font_01_sfnt_off0000ea65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 11468 bytes
SHA-256: 9af0d8eecdc37adb8c6d1eac099babf1d0a12d8636331679612ff748a0a5bb5b

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