Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a21a15fbe3a893a…

MALICIOUS

PDF

75.3 KB Created: 2021-02-21 09:51:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: a80836f4cb2b5226c3ef666964fb441a SHA-1: 86a25412fdcf639200b8a84d0513377e9a092518 SHA-256: 6a21a15fbe3a893a9188489a89dc1cf5992e98ad84234400649b601d09f24c04
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to homework answer keys. The presence of multiple disposable hosting links and a high ML classifier score further indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=vertical+shifting+of+sinusoidal+graphs+homework+answer+key In PDF document text
    • http://aromaita.space/chord_progressions_for_songwriters_pj2ubh.pdfIn PDF document text
    • http://yazansoft.com/driver_asmedia_xhci_controlleruafc8.pdfIn PDF document text
    • http://scm03.ru/fishing_guide_stardew_valleyxpp77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484994/normal_5fd6370aa8625.pdfIn PDF document text
    • http://wersita.space/555289722260adwu.pdfIn PDF document text
    • http://laithub.pro/informative_essay_outline_worksheetsufbj.pdfIn PDF document text
    • http://creditreportusa.info/professional_reference_letter_for_graduate_school_templatek9eiw.pdfIn PDF document text
    • http://copyrightsupport-ig.com/39923921898fbghe.pdfIn PDF document text
    • http://love-cosmetics.shop/hp_laserjet_p1006_driver_download_free3p5x5.pdfIn PDF document text
    • https://vutavevivusupe.weebly.com/uploads/1/3/0/7/130776898/6711321.pdfIn PDF document text
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/nafevotuwolutu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bonanelokuweje.rf.gd/15013638533.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/84358455175.pdfIn PDF document text
    • http://zofekaxezujujom.rf.gd/esto_que_soy_eso_te_doy_acordes.pdfIn PDF document text
    • http://petikagemejol.rf.gd/tegoborijuja.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/canine_hepatitis.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_off0000e745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE745 5792 bytes
SHA-256: 7ea4bbc6193095e2d75076f812d4475728111f923765ed5903271af968890238
font_01_sfnt_off0000faed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAED 10796 bytes
SHA-256: 74a675cf9a7b9a2662ded6e757df9c6b5c386b5d8547fc0293eeb567e53a9474

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