Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b78930621a1d729…

MALICIOUS

PDF

74.4 KB Created: 2021-02-15 23:53:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 695cdb10f7e7191a9e59f1396e2bc5e1 SHA-1: b83fe409dc5aae0ab0aea30908d8984fb35896d4 SHA-256: 6b78930621a1d72932510404c44ec13300d1547ea2f021979e1d9fd2c36a0b97
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The document body, though heavily obfuscated, contains text related to college admissions, suggesting a lure to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/123?utm_term=colleges+that+are+sat+optional+for+class+of+2021 PDF link annotation
    • http://yognat.space/69616610547i5n8q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_5fe64c07f1f11.pdfIn PDF document text
    • http://copyrighthelpptteam.com/forces_and_energy_study_guidehrfqw.pdfIn PDF document text
    • http://stavki.link/pan_baidu_er_script4skk5.pdfIn PDF document text
    • http://ladyso.ru/33012659689mkkvi.pdfIn PDF document text
    • http://fasad-dom.site/nelogovebanuniximnytlo.pdfIn PDF document text
    • http://helpcontactform.com/90962990073p8idr.pdfIn PDF document text
    • http://1xbet-regi.site/saxekaknc8d2.pdfIn PDF document text
    • https://cdn.sqhk.co/fezifenax/zgfhhph/calculator_for_guns_of_glory_prosperity_set.pdfIn PDF document text
    • https://cdn.sqhk.co/vivakawibaki/NhgUrih/92816992003.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/eijIhcn/warriors_characters_movie.pdfIn PDF document text
    • http://matroskin.space/zawgyi_font_unicode_freeit43o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/dadejuv.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/pinigesirumifejekasezati.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/cd_label_template_psd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/guarantee_letter_format_for_visa.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_off0000e521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 5508 bytes
SHA-256: 6d3acead9178f1b9ba90438b8cce5a0ad7c663eaa88dbed3f00bc1ee158aa1f5
font_01_sfnt_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 10544 bytes
SHA-256: e2d50efc35848c866dc237b8f5cca21680b2c79bdd0cea238fe6657ee5a2c807

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