Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8dbca68cddac0b…

MALICIOUS

PDF

109.0 KB Created: 2021-03-14 06:38:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 867c53a43dcad6e2b9607c57cb9277ba SHA-1: c8d7b6d68e73debd0b7d6fab15a94c4818421884 SHA-256: 9b8dbca68cddac0bf4fed9db4383c75d3cd5297d7ce55bffc2592ff14f7ecbc3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and 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 0.9997

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://seumenha.ru/wix?keyword=m.sports+authority+coupon PDF link annotation
    • http://geniusenglish.space/understanding_computers_today_and_tomorrow_15th_edition5mlhg.pdfIn PDF document text
    • http://magazinrf.xyz/84806981412lys0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380383/normal_5ff614bd66368.pdfIn PDF document text
    • https://cdn.sqhk.co/janezewufaj/tgiieja/cartoon_crew_2018_video.pdfIn PDF document text
    • http://myfirstsite.xyz/52190769624aocim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_6039980738f32.pdfIn PDF document text
    • http://doctorzlo.com/fapomopelugubixohml4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420587/normal_5fce4f214b54a.pdfIn PDF document text
    • http://form-copyrightservices.com/39002984990zpwju.pdfIn PDF document text
    • http://presalle.xyz/hp_officejet_pro_8600_scanner_not_working_macgnvft.pdfIn PDF document text
    • https://cdn.sqhk.co/kogoruzojif/gdeigHq/evacuate_definition_the_wire.pdfIn PDF document text
    • http://baranaydin.org/how_to_clean_dash_egg_cookeroafur.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/PjcW8no/kerisiwifagogana.pdfIn PDF document text
    • http://galoomer.online/58397158878yk9nj.pdfIn PDF document text
    • http://betmoy56.com/wodawijirej10tsz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404113/normal_60337eef17642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406228/normal_6034fd6cc0f37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/anatomy_coloring_book_free.pdfIn PDF document text
    • http://judafigot.rf.gd/43897051909.pdfIn PDF document text
    • http://lapukup.epizy.com/sapimeke.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/3879967391.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_off00016c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C3F 5128 bytes
SHA-256: 4cc4fba9394d9c3ea3382bc68f3ad51837a3e5454e985b25d7817b332f967789
font_01_sfnt_off00017dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DC5 12088 bytes
SHA-256: 34040a933a3b92e600b9314944a5052fff5571ed326166c935545010c51f55da

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