Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d548e7817f04a95…

MALICIOUS

PDF

74.3 KB Created: 2021-09-18 16:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 844b75ea1ba5e0decfe104ac5b7431a1 SHA-1: c4628e2649396836259f96a77a064f2ad1150064 SHA-256: 8d548e7817f04a953605c2855aa1615cdc458ca56fbfaa33afcf45725bab8881
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by multiple heuristics and a machine learning classifier, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs pointing to external PDF files, indicating a link farm or redirection mechanism. The PDF structure and the presence of external links suggest an attempt to direct users to malicious content, likely for phishing or further malware delivery.

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 https://quangcaowebsitecomvn.xemlaco.com/uploads/files/31798939251.pdf In PDF document text
    • http://one9five.com/userfiles/files/fumejo.pdfIn PDF document text
    • http://pb-book.com/user_file/file/kixunija.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/fanik.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/piluw.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4bbf0485aeeda09db8f4314b1bc3c983/genosifagaxesotu.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/25617671341.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/69612532361.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/22016132693.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/musitodivivuvubenutoza.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/xitiz.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/duwalax.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c338ba2be---kobepukonosiwoleginow.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/51099397146.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11686422630.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/fupokakofazug.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/defisudajej.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210910171808.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210910195644.pdfIn PDF document text
    • http://darec.sk/files/files/kekewakez.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/wegonoveg.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/70941429130.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/61338103607.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/misufofobidunifon.pdfIn PDF document text
    • https://dm288.rs/slicice/file/vojoresug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=minecraft+new+chunks+hackPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD837 16732 bytes
SHA-256: ced9e65d92c3b54b30685980a818aed6f5c305b94579c657f57bf6f0716dc12a
font_02_sfnt_off0001038d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 10540 bytes
SHA-256: 8f2d70f84e52376039c817b43e2ecd83dfb5309664fe1974b2c7990087a06787