Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3aafde00bdb64d3…

MALICIOUS

PDF

80.5 KB Created: 2021-02-13 18:13:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8480f4864a88e02168725566bb9541c6 SHA-1: 9bc321a2a4df904832f22a1d677d574f7173382b SHA-256: d3aafde00bdb64d3b84c07407a64c61c7ea79a21ab8d6854d8676c4208daad7e
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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=chocolate+gravy+recipe+paula+deen PDF link annotation
    • http://twirlini.com/download_faily_rider_mod_apk_android_14b629.pdfIn PDF document text
    • http://getcreditreport.info/ucr_uniform_crime_report_definition0ie87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464715/normal_601e6c68660ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_600a491a9f830.pdfIn PDF document text
    • http://verification-help.business/fudikabukomalexbt4m.pdfIn PDF document text
    • http://fitokapss.xyz/the_meaning_of_marriage_tim_keller_chapter_15raw5.pdfIn PDF document text
    • http://igme.site/galaxy_defense_21drl6w.pdfIn PDF document text
    • http://monubaz.iblogger.org/poserewirumi.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/geometry_dash_2.113_apk_downloadmux68.pdfIn PDF document text
    • http://normab-id.com/king_bed_sheet_set_walmartf14k4.pdfIn PDF document text
    • http://dhl-order.info/aio_launcher_unlocked_apkqmkqi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383452/normal_6004dfc864d5d.pdfIn PDF document text
    • http://info-pages.ru/49977422142w3x59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5fe6d348d74be.pdfIn PDF document text
    • http://xtina.online/34415002848rn4m8.pdfIn PDF document text
    • http://idem-peshkom.ru/12460717939zlbfh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478408/normal_6015560110556.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://runoxujozu.rf.gd/vajobufuranalakar.pdfIn PDF document text
    • http://lafeseg.rf.gd/diablo_3_season_14_class_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 5224 bytes
SHA-256: ca128cd88ac9512c1577765bd9c1bafeb3b1612730aa9c4adb9b262fe0756554
font_01_sfnt_off0001025a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 10772 bytes
SHA-256: 76d3e6cb782abf4d50bcb5807f3ba70d3d74843e3abfa34f5af6fcabbd30771f
font_02_sfnt_off0001270d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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