Malicious PDF — malware analysis report

Static analysis result for SHA-256 039935345bfc70f5…

MALICIOUS

PDF

72.9 KB Created: 2021-09-28 17:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 06c0b7cbc8d0a3c7882382da3e6aaeba SHA-1: fe54cdce25c9240c796b32319196d500682624ab SHA-256: 039935345bfc70f560513f690ba3eeaad28b64234eabc0898d0d9bff9d4984e5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to trick users into visiting malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://garglob.ru/uplcv?utm_term=hill+climb+racing+download+apk PDF link annotation
    • http://charmingcurls.se/upload/file/67358455352.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/wulutexuga.pdfIn PDF document text
    • http://pnalog.ru/images/file/xogaloxosogibejituvagomut.pdfIn macro / runtime command snippet
    • https://dampinggame.com/calisma2/files/uploads/88355508774.pdfIn macro / runtime command snippet
    • http://www.cddfct.com/up_files/file/tidibarurizopazi.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146b2bf48535---xijixub.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/14581386948.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/48688625695.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/zomuzuxevup.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/21245998619.pdfIn PDF document text
    • http://serting.eu/userfiles/files/suguzoku.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/forenojawurowotofinu.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///29130683175.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/gebabegazekadikote.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/kubokabo.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/mujinokevak.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/lexeputofekeligoxox.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/52929525754.pdfIn PDF document text
    • http://workontext.ru/media/file/84986245062.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/63885178863.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/vinesugeviruvibitubuzuge.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/42846920757.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f38fb39e817fea9f388ade89afdc8d96/49692866228.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/keweguxufomugifag.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/616904485.pdfIn PDF document text
    • http://jadever.vn/ImageIn macro / runtime command snippet
    • 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_off0000b46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46A 10768 bytes
SHA-256: b7c96f7e68ad378451021903f8c6f8b723876c40c3a49e164575e0ed1193f885
font_01_sfnt_off0000ccaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAA 18572 bytes
SHA-256: f66dcc920a064c0ae973ea7dcba3de9fdf963806bfe715a94030f939ba75b702
font_02_sfnt_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1