Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fbe7ab88845d996…

MALICIOUS

PDF

73.3 KB Created: 2021-03-05 19:37:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ee90e29ed5fad978013cf760ada17082 SHA-1: e446866026dfcb8aaf6478179e105c7ca864746b SHA-256: 7fbe7ab88845d996453dd2347f88802c63b5411571c9ffe046c76fc874f1be5f
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely aiming to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=does+my+baby+have+scoliosis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384639/normal_60160e28212e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419650/normal_60296f231a7ab.pdfIn PDF document text
    • https://cdn.sqhk.co/mojazejo/hijjgV8/nuwadikifovugape.pdfIn PDF document text
    • http://bomawowaziwan.iblogger.org/dudozulexad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_601db69a8e124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490141/normal_6021854c4ecaa.pdfIn PDF document text
    • https://cdn.sqhk.co/tunaluvum/jcibFhh/dream_league_soccer_2021_apk_obb_data_download.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/jcigxsZ/duwinenugezavuwupewuj.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/PhjBxha/vabozezeruvilota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450247/normal_600b42453720f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e6f68a2-72cb-4c80-8121-9e5fec07ce1d/likogukeduv.pdfIn PDF document text
    • http://dojeranorered.epizy.com/cessna_206_stationair_performance.pdfIn PDF document text
    • http://fedisumudajitu.rf.gd/pipuvediwo.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/liturgical_calendar_2018_catholic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df96bf1-4d69-4a16-9380-a6606a425423/79516503631.pdfIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_1eae5c54e64341b2a109501b1c8bed96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/82634855561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3750020-8201-4954-b770-595446118fee/46342854890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fa98301-5f9d-46ef-a406-e59e57db808c/battery_tender_jr_vs_harbor_freight.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/46519381694.pdfIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_2451cb70e7b245f8a43f35796f89562e.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 5244 bytes
SHA-256: d72a5394d0a44eb05bffc444fde54e32d86867450651d3928daf03bf2d77d017
font_01_sfnt_off0000f598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF598 9936 bytes
SHA-256: 99dad4c7878b6bdeb47b37af901ef463d48c566a0acf694cd97783973cafa0b2