Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f08abca7ead6b5f…

MALICIOUS

PDF

87.5 KB Created: 2021-03-30 00:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a8b783b849b2b3feaece491757103973 SHA-1: 30646b02b2ab4dc8060eb7c0f4ec57946c4141b8 SHA-256: 9f08abca7ead6b5fa20bc194f4f0862f2341f7b226989e4792df775f1bd13f9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's part of a chain designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://leonvi.ru/wix?keyword=nf+album+download+2017 PDF link annotation
    • https://cdn.sqhk.co/budufunewuf/hisheTJ/33492287717.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/ih8ujaM/xinad.pdfIn PDF document text
    • http://setofexperience.site/divotixukibavwhrr.pdfIn PDF document text
    • http://businessoutsourcing.info/275382936584ohn8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413013/normal_5ff2f3ee53bd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445531/normal_604d05d789f5f.pdfIn PDF document text
    • http://zesamoa.online/heat_surge_electric_fireplace_model_adl_2000m_x_manualg86x3.pdfIn PDF document text
    • http://prodson.fun/lejubuwojifikiwatodtiq2i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478687/normal_5fe4d7a952656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415543/normal_6017644929b0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385021/normal_60202721a7725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_600eb0f4a9c12.pdfIn PDF document text
    • https://cdn.sqhk.co/livulopo/lsRhbRq/steel_and_flesh_mod_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385021/normal_60202749aeeb1.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/UifPR6W/lopuge.pdfIn PDF document text
    • http://guitar.su/onn_bluetooth_clock_radio_with_qi_wireless_charging_manual6xavj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499636/normal_603e9e88a302c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376600/normal_5ff7601f121af.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/b93dec0c-14e9-44ba-9cb1-5d1943056108/26402476542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bd4c796-6f94-4937-9d19-8303c67f9c9e/pokemon_fire_red_cheats_gba_master_ball.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/java_jdk_102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38d44332-3330-4018-8ee7-2cb7450c0a21/blood_bowl_2_show_tackle_zones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d560df9-d3e2-49fa-99da-b78a8827fde5/is_the_2016_chevy_equinox_reliable.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/podokefofupubukuresi.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
    • https://bit.ly/2T5G0wj���OutcIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 5020 bytes
SHA-256: a014614d4ef83c45787b376f2e3c372f248e055db4ffdae04700889f21fa7ac1
font_01_sfnt_off000102d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 12024 bytes
SHA-256: 28c7343766742415b77b337d3fa05b9e6047d39edae22fc3399f9d9307810763
font_02_sfnt_off00012b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B62 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off00014090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14090 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176