Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4cd4281b57c3644…

MALICIOUS

PDF

78.2 KB Created: 2021-06-09 14:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5ebcae547216e996cbaf78381b390a41 SHA-1: a8f52c4f02e4288ea9e06368ce05d9c621b698f0 SHA-256: f4cd4281b57c364419602daf256317d1febebec05c6fbc05e3ac4d4c859ba4ad
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

This PDF document employs a link farm technique, presenting numerous external links, likely to disguise its true malicious intent. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document instructs the user to install or connect with a remote-support tool, a high-risk action in unsolicited documents. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature, suggesting it aims to trick users into granting remote access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://archism.ru/pbw?utm_term=charlie+malayalam+full+movie+download+720p PDF link annotation
    • https://pixizibonemitu.weebly.com/uploads/1/3/1/3/131382366/wagovuranobinitege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481166/normal_6021866ccb7e4.pdfIn PDF document text
    • https://rigavedisibabaz.weebly.com/uploads/1/3/4/9/134902328/xonedenupi_xiwetana.pdfIn PDF document text
    • https://sizasaligibi.weebly.com/uploads/1/3/4/5/134506534/tuwenika.pdfIn PDF document text
    • https://govubazidexifa.weebly.com/uploads/1/3/4/3/134342639/bopasevaluromipini.pdfIn PDF document text
    • https://wasoxojeroxinab.weebly.com/uploads/1/3/4/8/134888233/dabisisuwakama-jijoxidaja-kujolad-nexitomak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393889/normal_602d2df865028.pdfIn PDF document text
    • https://velalozelo.weebly.com/uploads/1/3/4/4/134498802/05a30ef7bd36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461202/normal_600a29c60e6fe.pdfIn PDF document text
    • https://worubagazew.weebly.com/uploads/1/3/4/6/134639575/nozupid-larojumukux-jorogesa.pdfIn PDF document text
    • https://mavekajokirusap.weebly.com/uploads/1/3/1/4/131437454/tinetigixevesisobizu.pdfIn PDF document text
    • https://sibanixo.weebly.com/uploads/1/3/1/3/131380297/9444507.pdfIn PDF document text
    • https://penomagara.weebly.com/uploads/1/3/2/6/132695387/9797376.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://rimikupababo.pbworks.com/w/file/fetch/144546042/teamviewer_quicksupport_apple_scam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98e8369b-74e6-4264-a150-cd21e5c0a43b/hoover_dual_power_max_carpet_washer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e61c4e0-52f1-40ba-8fc5-6248d033e4a4/ley_de_condominios_cdmx.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144418455/masha_and_the_bear_toys_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8568b67a-84d8-4113-9c42-753d450e5426/malafatopijuvamiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d560266-40fe-4fc2-a714-d825603f5005/nukod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1f9d726-b796-4f43-9d18-c2002e6c43dd/polk_audio_sb1_plus_manual.pdfIn PDF document text
    • http://winubuton.pbworks.com/f/72565491955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/902cdd0c-7aea-4896-a2e2-44ddd52554b8/is_alkaline_water_better_than_acidic_water.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_off0000e5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 5536 bytes
SHA-256: f268cdf029b71b711a03d6d668b26b4d91abd9c92fa549bedc15f372204e26b0
font_01_sfnt_off0000f8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 10608 bytes
SHA-256: 6c9681347da704d73b4fedad1ab1d11752c31761732403918a294e207d8388c3
font_02_sfnt_off00011ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE5 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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