Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a339d7eb2384f14…

MALICIOUS

PDF

67.4 KB Created: 2021-09-30 20:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f32428345de86fc629bee7d9a950e162 SHA-1: 772f031876f191cec8617baa1761d861a9f600cc SHA-256: 5a339d7eb2384f14bceded80d1a88dc531d78737e9f553118c68a45cf6b103b6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's an image-based lure designed to trick users. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing campaign. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://splhardware.com/UploadFile/file/2021091600460273499.pdf In PDF document text
    • http://driver-jazda.pl/upload/file/legagunaxoketar.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/51095574615.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/nimutu.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/menazuk.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/50931887151.pdfIn PDF document text
    • https://kueapem.com/contents/files/zozoleguvezow.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/73361901377.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/30436968667.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/21301951252.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/51413463946.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/fuxen.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/nobotafepagafimefujixar.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/vufatipuxomek.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/vomabok.pdfIn PDF document text
    • http://homeopathyhk.com/files/35343434708.pdfIn PDF document text
    • https://nomortiga.com/contents/files/vineworozevobowijawinig.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/86695116103.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/8175174281.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/41118313740.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/75339600143.pdfIn PDF document text
    • http://debten.net/UserFiles/File/puwozaxi.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0772ebd6---6782620952.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/62626535731.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/45810967027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+otnPDF 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_off0000aed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED0 14280 bytes
SHA-256: 52bbe1f638624e4f3a34d3bc2f830ac73847b68ac34707d89bd54d976b6fa74a
font_01_sfnt_off0000d282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD282 9920 bytes
SHA-256: 667851fc9ac26785be9f42137fc996543b291fa8bff497669f4ec9f9a8d52a09
font_02_sfnt_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1