Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d389f020dafb76…

MALICIOUS

PDF

66.1 KB Created: 2021-01-01 02:05:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a2818d4c595030ae328ce8d7a3ee79c1 SHA-1: 1c5d80fdf022804e117d4df3cfc337af2656f6cf SHA-256: 79d389f020dafb76065d078b3192b8c75445288bf9969a1c93722ea8df685eba
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL suggests the document's purpose is to lure the user to a compromised site. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/123?utm_term=ap+calculus+bc+multiple+choice+2015 In PDF document text
    • https://cdn.sqhk.co/mugejufunij/Kkhibgd/claw_machine_surprise_eggs.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzomorikat/HeIhjEe/lone_survivor_game_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/dejenuluzew/X3K7Uig/77640515353.pdfIn PDF document text
    • https://cdn.sqhk.co/jukusenefow/gXijR0B/57206467288.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/dRigtzh/27154169690.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/fovezewi/lapuwakomevodorod.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/vst_bandoneon_free.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/27273627985.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/family_gift_ideas_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/athelas_regular_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/commoncoresheets_finding_volume_of_rectangular_prisms.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/11702874495.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/suxodajedo.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_off0000b70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70B 5432 bytes
SHA-256: 94dd754f4c069238555b6d548f29557f60dbe4bfbb2e5e16fdfa12bbe51e7be1
font_01_sfnt_off0000c988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC988 10464 bytes
SHA-256: 79b6f5aad2c1868dd0698e4c2e22af1cc7fc39ff38c02ae7ebc9a536248feb46
font_02_sfnt_off0000ed56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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