Malicious PDF — malware analysis report

Static analysis result for SHA-256 0815c014e5e2b26f…

MALICIOUS

PDF

73.2 KB Created: 2021-02-12 14:21:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2aa4336d4244688f5b206ceda657af40 SHA-1: 1176116aeca3727e0e2fd6e42ddf2730274e1a00 SHA-256: 0815c014e5e2b26f87e2da3ef0a6e8f3007d40a008269dcb563f4ef6ea9a8e9d
126 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to distribute further malicious content. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets, aiming to trick users into downloading the malicious PDF.

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://leonvi.ru/wix?keyword=kinds+of+chemical+bonds+worksheet+answer+key PDF link annotation
    • http://yatvoyya.fun/duloju8s3w.pdfIn PDF document text
    • http://leftoutclub.com/21573354616ks7qh.pdfIn PDF document text
    • http://org-fruit.space/fotilefanewi2jckn.pdfIn PDF document text
    • http://mosdendy.store/35788330879stis1.pdfIn PDF document text
    • http://mangalvpodarok.ru/62442160475nsogo.pdfIn PDF document text
    • http://ziwavabewite.66ghz.com/44950958459.pdfIn PDF document text
    • http://naturka.space/quickcam_e1000_windows_7_driverbtxax.pdfIn PDF document text
    • http://microdigitalmeter.xyz/7256875811id4r2.pdfIn PDF document text
    • http://getbuiss.online/3d_shapes_worksheet_grade_416ujr.pdfIn PDF document text
    • https://lejawoxaniw.weebly.com/uploads/1/3/0/7/130738778/9869036.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/buah_merah_side_effectsl82gx.pdfIn PDF document text
    • https://xipumizi.weebly.com/uploads/1/3/4/7/134746986/sodelafigotur_wobuxikalu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zapuwoz.epizy.com/36942278706.pdfIn PDF document text
    • http://funazowo.rf.gd/alamofire_file_name.pdfIn PDF document text
    • http://vumavoralamo.rf.gd/spotify_premium_offline_apk_2019.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_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 5628 bytes
SHA-256: 7b4dd4f9d763d6fef314614fbc6a84511860da1a8e0c9e5879e067de8d7fffb5
font_01_sfnt_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 10264 bytes
SHA-256: e87b913c964db9c52fc34e72a007e871e211787ea1981c982629126ce730b2dc

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