Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3eee55d8d9a00c6…

MALICIOUS

PDF

76.6 KB Created: 2021-03-31 23:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 184206aaeccd705ec967b8c90613e860 SHA-1: c4380812136f0b24f42d15810f75904ba9706746 SHA-256: d3eee55d8d9a00c6f9d00ac81e4544000b8601e2c1cc23c252d04a31e31ba43b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, suggesting it functions as a link farm to distribute phishing or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, using disposable hosting and UTM parameters for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=a+form+of+communication+word+stacks+level+40 PDF link annotation
    • http://rozewevojalel.sportsontheweb.net/lavefavepaxuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471484/normal_601d8b772a69d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5fdc66cc78b2d.pdfIn PDF document text
    • https://cdn.sqhk.co/nudadubuju/X2Um2hj/jifiwurerijimoralaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417205/normal_60192c6990efb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417023/normal_602c0569c70b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_605f3cdeaac5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387410/normal_605c29fac1a60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443810/normal_604baee42ac8f.pdfIn PDF document text
    • https://cdn.sqhk.co/muzexeragod/jDgjyit/police_siren_noise_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/livejizilul/X2UoghM/brightburn_rating_parents_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_600dde456b50c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_602373adabfb6.pdfIn PDF document text
    • http://zokiwedilar.mypressonline.com/41373978571.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/cutting_edge_beginner_student_s_book.pdfIn PDF document text
    • https://cdn.sqhk.co/bunewonu/WigcQjc/band_companion_app.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/makalah_penyakit_anthrax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465694/normal_5ff573ecd0c4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8384dd7-2093-4703-8928-7c90bc091954/bivip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96a1e75f-6f12-4011-a901-672b1f2665fb/47056587074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c33294d6-2593-4235-a66f-24b38d856b6e/logesoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/678986f4-c984-4238-9364-22983f602fc6/planet_bike_proteg_9.0_computer.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_off0000ea0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 5600 bytes
SHA-256: eea550d828f08b15d2bc466d37d6b6b3b0ad6d0ec4d7589142ee08d17d59ca56
font_01_sfnt_off0000fd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2B 11312 bytes
SHA-256: fe898e53cacf5c1663e888a5991166cab17e85148ded7477339effaccf61f9c0

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