Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b008af3b0df50fb…

MALICIOUS

PDF

68.6 KB Created: 2021-02-12 00:13:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5fb70982c575c238f0fd72f26f668a31 SHA-1: 406293b76caaddf5f85ad0ee55a6c786162ec881 SHA-256: 5b008af3b0df50fb6e25fd7f5da4d9ed68113897ebf38e5ead602be01c935856
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO spam. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=johnson+88+spl+manual PDF link annotation
    • http://zikuwojanubeg.iblogger.org/diablo_3_stuck_at_0_b_s.pdfIn PDF document text
    • http://kifenefazujiz.iblogger.org/kuwugijunigunemomutame.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409244/normal_5fe18c659a9a0.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/ido5Tzx/ravensburger_solar_system_puzzle_300_pieces.pdfIn PDF document text
    • https://cdn.sqhk.co/penazavoxu/iihaAjf/shark_evolution_fierce_shark_making_clicker_mod_apk.pdfIn PDF document text
    • http://sikalaporaka.22web.org/bz20_album_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/gjhal4V/jewugawife.pdfIn PDF document text
    • https://cdn.sqhk.co/koroxofusino/2wTIYki/37105062280.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/bU2Fhhl/football_european_championship_2020_tickets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406812/normal_601e784faaef9.pdfIn PDF document text
    • https://xisifogobodi.weebly.com/uploads/1/3/4/7/134735845/7135c3d97dca7e.pdfIn PDF document text
    • https://cdn.sqhk.co/kugoxepif/hiksmeX/chicken_invaders_5_download_full_version_pc.pdfIn PDF document text
    • https://wonelapafilujol.weebly.com/uploads/1/3/1/6/131606162/2396743.pdfIn PDF document text
    • https://cdn.sqhk.co/joxomawezu/Dp3Enif/safaricom_card_recharge_scanner.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/bziagi2/sanitarium_blues_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruleruz.epizy.com/powerpoint_template_overlapping_circles.pdfIn PDF document text
    • http://zorogeloma.epizy.com/36881204138.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_off0000d067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD067 5144 bytes
SHA-256: 17c156401e6996c9f103fb67fe34b52354c5b92eaf091deed7f1043c6593437b
font_01_sfnt_off0000e1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 10524 bytes
SHA-256: f9a8ef51c715cac3178357b3d714a4a2cc562f1a89752339a17f6d4a2ad47350

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