Malicious PDF — malware analysis report

Static analysis result for SHA-256 986770f29942937b…

MALICIOUS

PDF

140.7 KB Created: 2021-03-26 13:54:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4b41537d884b2a501b8c0a82f1b00b88 SHA-1: 426e0e5cf16934116ade5744ec3ebb94c51319f9 SHA-256: 986770f29942937b35be895c3534c5ffd43e4a0d3476154f6798940eec37a4e7
134 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a high density of external links, many hosted on disposable domains, characteristic of link farms used for phishing or malware distribution. The presence of urgency cues further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kuzutuzo.ru/123?utm_term=archilovers+app+android PDF link annotation
    • http://takodevizol.iblogger.org/free_event_management_html_template.pdfIn PDF document text
    • http://manthoughtswebsite.website/xurusenowkblwf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460228/normal_5fcbae6b198dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_5fd2857918017.pdfIn PDF document text
    • http://joblanc.xyz/crash_fever_ultimate_guidebvm4v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387699/normal_603bb9dacdd14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454306/normal_603125e47ec62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502464/normal_5feff5ec66bfd.pdfIn PDF document text
    • http://pubguckazan.com/948275941808f0h.pdfIn PDF document text
    • http://boevoenlp.com/what_does_margin_of_safety_ratio_showc5ruy.pdfIn PDF document text
    • http://jupumatoza.iblogger.org/betamethasone_topical_davis.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
    • http://kafudunafow.epizy.com/80611229234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a6cb104-9529-4b9e-bb14-05d764149eb4/samsung_grand_prime_plus_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/william_shakespeare_sonnet_55.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d79105d-d52a-43a0-8d55-e8855781b3fc/what_is_speed_of_light_formula.pdfIn PDF document text
    • http://nufufud.epizy.com/calendar_template_calendarlabs._com_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/injustice_god_among_us_apk_mod.pdfIn PDF document text
    • http://lulevewutowa.epizy.com/gurexu.pdfIn PDF document text
    • http://kozifina.epizy.com/botello_elementary_school_uniform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f459dc6f-17d6-40bb-8a28-baaba81b38c5/77845724904.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_off0001dfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFB9 4920 bytes
SHA-256: caa3942e80d80b02528ace5c2fa9578ace29bbe3a41a0130f629de25f6298606
font_01_sfnt_off0001f054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F054 11860 bytes
SHA-256: ee0503ae06cf37d9bd41f2219e7fa888ba20f422820adaacdd4e1cf2855f1333
font_02_sfnt_off0002175e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2175E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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