Malicious PDF — malware analysis report

Static analysis result for SHA-256 99982fcb87ce5077…

MALICIOUS

PDF

80.0 KB Created: 2021-09-21 03:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6bb6096f88c3656667b14c7dceb2e904 SHA-1: a5905338138f73e2c315decc873b9b8d8bd6970e SHA-256: 99982fcb87ce5077dfee776b72612844b542e59701de679be8a2eb8cc4fbf914
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and a large number of external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=how+to+ping+on+android+phone PDF link annotation
    • http://ukwoodrecycling.com/userfiles/files/59045769087.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210909162408.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/jalalaxedevumubugobolor.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/51901234672.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/43604679238.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/pakulibeponutaxeka.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/75248517940.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/13679484782.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/66389548390.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/loluxor.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/47723671979.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/28373026547.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210919_091556.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/norejipakemonak.pdfIn PDF document text
    • http://computerdoki.hu/user/file/riluzawipitixokobujikim.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/gotadukop.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202197446564448.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210907002347.pdfIn PDF document text
    • http://hla.vn/upload/files/71309851298.pdfIn PDF document text
    • http://zeci.nl/im/image/jubiku.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/maraji.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/52709480717.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/4001689117.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://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_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 16452 bytes
SHA-256: 84bb549db33f8f1755b46000716935f0c525a7cd9937a97c6e817183a6806b76
font_01_sfnt_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 10532 bytes
SHA-256: 07f084684de84cb3692d6efcb2bf240cb60cc91d229670e9b5cb71c12aa8b9d4
font_02_sfnt_off00011a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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