Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a03103ed580f71…

MALICIOUS

PDF

67.9 KB Created: 2021-09-27 07:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 3bbcac42594100850ad4a78ae75d41fb SHA-1: 31db99fd919dcd345f338a6f625365f1dd6ecac1 SHA-256: 84a03103ed580f713294674abc6a51d95cf2efe2982e6026c306ba29cffac6ec
126 Risk Score

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 0.9973

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 http://mc-opony.pl/files/file/45444616247.pdf In PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/loxasofod.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/8502787942.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/vuvaxitamenaruti.pdfIn PDF document text
    • http://fikszo-whc.com/userfiles/files/83324925861.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/ruxabozetiwel.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/fewunudurolekutavonifajiv.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/12605763320.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/55341146336.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/789235489.pdfIn PDF document text
    • https://pisausakti.com/contents/files/7685795273.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/226479944.pdfIn PDF document text
    • http://anhhuynoithat.com/asset/files/49266118078.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/roxugutekovagorewef.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/refofoxop.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/86490716709.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210914093011.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/kiwutu.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/xifixuxekijaxage.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/96944680587.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161368495adf1d---sonugomizuvatozaram.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=best+voice+changer+for+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC463 14832 bytes
SHA-256: 9f8aeec56660489fa51a94522733d0563b189a572ffc38a8bd5206a33507f136
font_02_sfnt_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 10828 bytes
SHA-256: 1f961288e9bc9fa77faaee59f2a8397e7ee8c178b2fa34156d39c49196da98a7

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