Malicious PDF — malware analysis report

Static analysis result for SHA-256 e892e119ae3904d5…

MALICIOUS

PDF

79.2 KB Created: 2021-09-24 03:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 63c6b5ac19bf88e45596016fc5424376 SHA-1: 10053aa59d4bcf08fcf79abf5458db7ae4320a4d SHA-256: e892e119ae3904d510b414254a693cd912d248d9085586cae360f3053340b4d2
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including one pointing to a potential download, and a heuristic firing for a 'download button' lure strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=toca+city+apk+download PDF link annotation
    • https://anhhuynoithat.com/asset/files/66599995371.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/dumevuta.pdfIn PDF document text
    • https://designclarf.it/file/82184316676.pdfIn PDF document text
    • http://afro-safari.com/upload/files/kadow.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/mizubuligonerawuse.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/38119058919.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/80778739453.pdfIn PDF document text
    • https://denimder.org/resimler/files/nubakozopavoto.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/disipuxudi.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/wamutozebisudifuxugen.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/79605325384.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/niranuvametarutoxi.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/78597189077.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/48681352366.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mofiwiruwezurep.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///wisexasadib.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/93595757020.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/kejifatovafojuvekaban.pdfIn PDF document text
    • http://matras-devison.com/upload/file/61786298919.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/65649009383.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_off0000cbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEA 20312 bytes
SHA-256: a98b1d322e1b3ab3f43c9ae46ee9e9068702c8bcc656c21843c45491220f9031
font_01_sfnt_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C0 10360 bytes
SHA-256: 26a73653418daf93a2afd3344c7e22c374219b704a0c7aa0f9efda76d105995c

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