Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd43edc343af8a6f…

MALICIOUS

PDF

99.4 KB Created: 2021-03-30 17:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 84d6e3936f0b49845284bd7926d9906a SHA-1: 2cee797166a766d98b68ce3381aae35518a34cd9 SHA-256: dd43edc343af8a6f3bb1b5112173e841151fbe81c30615c54a9e05e115c8bf63
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The presence of 'powershell_virus.pdf' in the document text, flagged by SE_LOLBIN_RUN_COMMAND, indicates an attempt to disguise malicious activity. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification, likely involving phishing or the delivery of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • 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.
  • 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://druttle.ru/award?keyword=spielplan+bayern+m%25C3%25BCnchen+2020+18+pdf PDF link annotation
    • http://mumijivamivaxij.medianewsonline.com/how_to_remove_windows_powershell_virus.pdfIn PDF document text
    • http://leludezoz.scienceontheweb.net/introduction_to_bioorganic_chemistry_and_chemical_biology_solutions.pdfIn PDF document text
    • http://lapiwudoxavov.scienceontheweb.net/xofokumuwijiwikak.pdfIn PDF document text
    • http://nosilekexiwot.mywebcommunity.org/71350472651.pdfIn PDF document text
    • http://leludezoz.scienceontheweb.net/inIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rufapapufogap.onlinewebshop.net/24332957380.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/bill_of_exchange_example_uk.pdfIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_2e2742cd7f7e4a178e75b312cd425655.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/brothers_day_movie_songs_maango.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_ca3a5af93c6a4e22b023ee057aecbce2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/crunchyroll_premium_mod_apk_free.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/dusined/29427470944.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/ethos_blaze_farm.pdfIn PDF document text
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_1cd4e0cb069b43a89792d238da886611.pdf?index=trueIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_5d527eefe8eb452c89f65c28ee514aa4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/8548994193.pdfIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_0a16a7584d3147ef85ba6e9a7c67941e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/nordictrack_act_elliptical_used.pdfIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_3ac5726119784e19af8cbfd69724ba7e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libosokune/why_is_my_deep_freezer_not_cooling.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/tisiradepexuposaw.pdfIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_4f3dea4aedf548eba32f82c11572ea80.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/78436795942.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/77788256069.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEA 3136 bytes
SHA-256: df71740bcf0f50be481a3519b744d391d1383f2cad4370a7003c069d562e3104
font_01_sfnt_off00013815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13815 6204 bytes
SHA-256: 22e83c71fed85730a8803974979dd42f0ca3a8ace8b5ced90e6c6ffe4aa3acb1
font_02_sfnt_off00014cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD3 2248 bytes
SHA-256: eeb14ca9b84176a50595711826b42a082631da991a98f149c042367dbbf0def5
font_03_sfnt_off00015727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15727 11400 bytes
SHA-256: fd9f47b21137fa2bf1519f57e0864cb3f117648f00c854c4f94f3d68a2512d5d

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