Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1559b3f73c7daf7…

MALICIOUS

PDF

80.3 KB Created: 2021-02-13 10:07:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0ee62f85c3f5d08ec269c8caddbf4895 SHA-1: 618c16cf9117a9063229611972f0a070400a877b SHA-256: f1559b3f73c7daf70ac493718ace1368a7e6cb689ea7f55e1235f5043377d21e
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous links on disposable hosting suggests an attempt to redirect users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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.
  • 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://crophysi.ru/wb?keyword=iflytek%20co.%20ltd%20annual%20report In PDF document text
    • https://cdn.sqhk.co/bixatavafut/uigpjf1/red_alert_transformers_cybertron.pdfIn PDF document text
    • https://cdn.sqhk.co/jisujesox/PgeDOhg/vimusi.pdfIn PDF document text
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/nilixamosu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416930/normal_5fe1317c6c879.pdfIn PDF document text
    • http://getegenufiduso.66ghz.com/excel_bedingte_formatierung_zeile_frben_wenn_text.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/cigpghj/1862383156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425726/normal_600c7be5874f9.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
    • http://jutefuzu.rf.gd/28626992007.pdfIn PDF document text
    • http://xilibosukotijob.epizy.com/email_signature_templates.pdfIn PDF document text
    • http://supegawezokex.epizy.com/laferorolujugot.pdfIn PDF document text
    • http://bosurigazo.epizy.com/bansal_classes_inorganic_chemistry_study_material.pdfIn PDF document text
    • http://kowewewabozete.epizy.com/remujad.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 4940 bytes
SHA-256: b7052c9c93c5548a8bee42bd2201b4abe34b3bce3307e482f207708b4dc2989c
font_01_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 11004 bytes
SHA-256: 2d83b2f78631349a9f87a49c9aceba340ca9b5001ce81a75cd00e9f0ea420820
font_02_sfnt_off000111a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 16060 bytes
SHA-256: 313c3940a6f4aae92ceaa1b1a843de6e6f13411355a457aba6e018c383fce54c
font_03_sfnt_off0001263e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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