Malicious PDF — malware analysis report

Static analysis result for SHA-256 7779b194c3642670…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 00:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f65cf6ec435c7c28c510b3876ea29bbe SHA-1: a20b4373b2c5643440a9f312873764003380463c SHA-256: 7779b194c36426701f0817fd93f2804ace0e03bab2c378d1756107be982caf05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains or are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://uro-medical.pl/zdjecia/fotki/file/12586517574.pdf In PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/25076565152.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/43125157083.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/ranakidikegeka.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/46885794958.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/foroxitivitag.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/janokejagudam.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/mopijetuxovilo.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/firawa.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/44442692467.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/kibug.pdfIn PDF document text
    • http://www.polni.si/Images/files/28423416526.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/81266050520.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210911_085BAEE7D8DD768D.pdfIn PDF document text
    • https://preciseenergygroup.com/media/40353416563.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/51753570652.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/05/xokefalum.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/sefujazilawoxa.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210908230452852.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/peleze.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/garevanowifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=erotic+romance+novels+read+onlinePDF 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_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 10580 bytes
SHA-256: ad77631140455f3ac92c69335bc82d962160ca8747ac6c9b1b5468f44c2c346f
font_01_sfnt_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 17560 bytes
SHA-256: 799cca66cb0e121c630e3492b8af6e77fca62a1ee451ab4e5d97fa9d51567cbc
font_02_sfnt_off000125ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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