Malicious PDF — malware analysis report

Static analysis result for SHA-256 6637ccaa772eae10…

MALICIOUS

PDF

73.5 KB Created: 2021-06-14 02:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 68e6c123e56c893c9c268bc7f859b5cf SHA-1: c7484446336c1d3764eecb36d26d226d0d2ebbed SHA-256: 6637ccaa772eae10133baf9a04f5fcf941cc4b7e1c5bcb7657ccbcfb05e06b5c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://queure.ru/pbw?utm_term=add+two+pdfs+together+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380869/normal_602ddc716ba67.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4493201/normal_60b6b1764d250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388289/normal_6016cbc5da4b2.pdfIn PDF document text
    • https://xafokakiza.weebly.com/uploads/1/3/2/7/132710638/4049477.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385213/normal_5ffa0b969a8cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490380/normal_60bc7d8fa06ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402280/normal_6035df929a8ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413467/normal_60c25a80cb5dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411493/normal_601b18138f614.pdfIn PDF document text
    • https://doxemikawapuki.weebly.com/uploads/1/3/4/3/134314999/lepetizopog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490366/normal_6023724071c6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_603063b916b05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393035/normal_60386dc6d15ff.pdfIn PDF document text
    • https://saguwaxofules.weebly.com/uploads/1/3/2/6/132681351/a2c88d99a53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452850/normal_60375b84acf50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384645/normal_602c2553ea028.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xozojonurom.pbworks.com/w/file/fetch/144909450/windows_activator_text_file.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/w/file/fetch/145015797/jidawuxuwibixa.pdfIn PDF document text
    • http://lurilimid.pbworks.com/w/file/fetch/144796143/exercices_mlanges_homognes_et_htrognes.pdfIn PDF document text
    • http://milatufed.pbworks.com/w/file/fetch/144985023/fotoluposisup.pdfIn PDF document text
    • http://jareleleliz.pbworks.com/f/93009176087.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_off0000e35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35D 5172 bytes
SHA-256: 7aaba6601692b419a725b985fe3add402cf32dcc1435b5bd421f975fb3099ce2
font_01_sfnt_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 10676 bytes
SHA-256: 2a1740f5ca53868466b7fab6beca1048a3cd141f495f5ab3529e068776cb10fa

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