Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88b3189772b15cb…

MALICIOUS

PDF

86.0 KB Created: 2021-02-10 23:07:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ef5c4bed4ccfcc1bb1a16b01040d1539 SHA-1: 383831462f3ad9de3e5da6ed5055265de5153a0a SHA-256: c88b3189772b15cb222517e483c99fd10807a59ea21261a507597b2ed13c290d
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, many pointing to disposable hosting, and one specifically mentions 'openvpn android apk google drive', suggesting a lure for software downloads. The presence of embedded URLs and the nature of the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=openvpn+android+apk+google+drive PDF link annotation
    • https://cdn.sqhk.co/jagojixego/ePj1Ugi/cannon_ball_explode_on_impact.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/gTCgcid/growtopia_cyber_monday.pdfIn PDF document text
    • http://sojuvofud.22web.org/70254041305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_6014d6821ff54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469104/normal_5fc96924d1c46.pdfIn PDF document text
    • http://ejinaya.com/45607959378yfv6m.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/hhijhii/zerinarodujawoxe.pdfIn PDF document text
    • http://prognoz-football.club/cucumber_plantation_guide_in_the_philippinespz64r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462038/normal_5fdb2cba25478.pdfIn PDF document text
    • http://mjawebdesign.net/4872379638g3uen.pdfIn PDF document text
    • http://nefidale.22web.org/17101302291.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444369/normal_60054835a77ba.pdfIn PDF document text
    • https://cdn.sqhk.co/fimirexuf/dTHwOWu/gojulidagukuxerejo.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/mgdrigQ/tear_down_the_wall_lyrics_demons_and_wizards.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://s3.amazonaws.com/sajatofubote/katakana_printable_worksheets.pdfIn PDF document text
    • http://bimumebuzof.epizy.com/large_format_camera.pdfIn PDF document text
    • http://xowitulodif.rf.gd/gemukiwezikurivi.pdfIn PDF document text
    • http://welolazudadiv.epizy.com/whatsapp_for_nokia_e63_symbian_2018.pdfIn PDF document text
    • http://funuduki.rf.gd/bootstrap_website_templates_free_for_education.pdfIn PDF document text
    • http://lofapubuwuleto.epizy.com/14096391347.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_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 4808 bytes
SHA-256: b7fc0fc4c79d5eb5e3d6a0920e0200e6aa1281faa47897b5a20135100042c65e
font_01_sfnt_off0001184f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 10520 bytes
SHA-256: 44403c5878e5242750e354d7557edbd038ec497486a138924bb4152f3f463e76
font_02_sfnt_off00013c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C19 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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