Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c65f0edf1e1d18…

MALICIOUS

PDF

76.3 KB Created: 2021-02-22 10:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81ad63dd9ee36e9ee7c0ddabe91c583a SHA-1: d46afd8ff9af51e33c0f2cec3fe63d8c9dca417e SHA-256: 16c65f0edf1e1d188097eb8d0a17e57bced7122f69fae7bdafa6083ee35ed905
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://maypoin.ru/123?utm_term=ge+dehumidifier+50+pint+manual
    • https://cdn-cms.f-static.net/uploads/4393363/normal_602a1a5cdb404.pdf
    • https://tixilumudesowor.weebly.com/uploads/1/3/6/0/136095614/savomaxixadolut_diritaxavul_kazixipiladaje.pdf
    • https://daradila.weebly.com/uploads/1/3/1/4/131438164/8399021.pdf
    • https://cdn.sqhk.co/kixepijap/jZDFnlj/motorcycle_wallpaper_for_iphone_6s_plus_live.pdf
    • http://microbladingeyebrowsdallastx.com/eastman_lake_madera_ca_fishing_reportj94w3.pdf
    • http://bupro.asia/89985444219nb1ms.pdf
    • http://ca-manalapan.space/7817626142qem1b.pdf
    • http://astropsychology.website/aluminium_alloy_1100_datasheet50ncf.pdf
    • http://haifaiv.ru/kofepakosaxblb9.pdf
    • http://roman-holidays.shop/jsw_roofing_sheet_costhn47h.pdf
    • http://1cats.space/bios_straty_selantesk2lcu.pdf
    • http://moitender.org/janasheen_mp3_songs_downloadcpfmy.pdf
    • http://hallhq.xyz/batman_arkham_origins_apk_data_modw0ppk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e06f.bin
af51fd129b58e864f28a4ccd241e5747ceec13e9541b9939cac1d2fb15b84211
pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 5172 bytes
font_01_sfnt_off0000f1db.bin
8d08707644a469950ca8bea674fdcff00fb7e7d93e820f30f6f628b9c31cb6bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 10784 bytes
font_02_sfnt_off0001168e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1168E 4324 bytes