Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bd04cfaf657163…

MALICIOUS

PDF

78.4 KB Created: 2021-06-06 11:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3f502f10541ce96713506244ce7890b3 SHA-1: 75394725e30c7306b49de10f98e5f813fc031fc2 SHA-256: c4bd04cfaf65716375f9c537f81ce14c840beac20485cb2295442a4d59f63a0d
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://cructi.ru/pbw?utm_term=why+is+my+wine+cooler+beeping PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453720/normal_5feed2237ba03.pdfIn PDF document text
    • https://xesawamerubipox.weebly.com/uploads/1/3/4/6/134629950/f896184477e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_604ba44cbdcde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411683/normal_604ef1a565b1d.pdfIn PDF document text
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/4085254.pdfIn PDF document text
    • https://serofewaz.weebly.com/uploads/1/3/1/3/131379274/netusikibinuje-pupekatebaz-vumapewibetur-lalagejelofoda.pdfIn PDF document text
    • https://titepusigob.weebly.com/uploads/1/3/5/3/135392267/9fa3065c66.pdfIn PDF document text
    • https://pikotawikeju.weebly.com/uploads/1/3/4/4/134496208/5942523.pdfIn PDF document text
    • https://varanikugeju.weebly.com/uploads/1/3/4/6/134640125/853564.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477139/normal_5ff6a8ce981a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464311/normal_5fcecd18d1742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368732/normal_60bc265654498.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/144645606/mezavevibek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f85a008d-467a-4020-9d82-2f4da883442d/juravujelurenedufawot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab3c2517-1f51-46d9-be14-43267c52248b/left_behind_lyrics_fnaf_sister_location.pdfIn PDF document text
    • http://fepazonavu.pbworks.com/w/file/fetch/144711165/smirnoff_raspberry_vs_absolut_raspberri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d0ceddf-9ebe-4e37-b7fd-72b2e43fea61/49504737455.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_off0000f66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66F 5484 bytes
SHA-256: 7788ac335185dda67351ef14119138b733b70987adb58ddabfb6878677cb4bef
font_01_sfnt_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 10608 bytes
SHA-256: af68caf80076897a6c2ad575db1230811bc3681c40535efc7e937fe3bf88f539

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