Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f83039838032973…

MALICIOUS

PDF

76.1 KB Created: 2021-06-02 10:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b286e1a8e2776444b777362808651d0 SHA-1: 748aae39f14855b4afb4bf678886263233f29a4b SHA-256: 7f830398380329732219f2a4d075bbc1137aa6394dad2f9bb4058cd90b3a5b05
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the heuristic firing for a 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/pbw?utm_term=veronika+%25C3%25B6lmek+istiyor+pdf+indir
    • https://jovuwimuj.weebly.com/uploads/1/3/0/9/130969820/8094121.pdf
    • https://mafukizagodixep.weebly.com/uploads/1/3/4/5/134525221/votefuvepewo_fipuv_befagijorofivu_zepimewi.pdf
    • https://cdn-cms.f-static.net/uploads/4365657/normal_60359f31d6901.pdf
    • https://cdn-cms.f-static.net/uploads/4417824/normal_602d55d7714c0.pdf
    • https://kigokowolabewal.weebly.com/uploads/1/3/4/1/134132594/donoxokilepe-zuzusisar.pdf
    • https://static.s123-cdn-static-d.com/uploads/4454056/normal_60b52189d1f49.pdf
    • https://cdn-cms.f-static.net/uploads/4478393/normal_604d1c095dceb.pdf
    • https://kemizanina.weebly.com/uploads/1/3/0/7/130738765/sukum.pdf
    • https://sedezexe.weebly.com/uploads/1/3/4/3/134342112/fuwezebureke_remesinifowisug.pdf
    • https://cdn-cms.f-static.net/uploads/4417423/normal_6026a38b24040.pdf
    • https://jasujidavoja.weebly.com/uploads/1/3/4/7/134770870/415436.pdf
    • https://lezogifivejuz.weebly.com/uploads/1/3/2/6/132682585/duxevu-sufezetuv-wupem.pdf
    • https://static.s123-cdn-static.com/uploads/4426090/normal_5ffcf7e062330.pdf
    • https://cdn-cms.f-static.net/uploads/4409102/normal_60463b8e71e1f.pdf
    • https://cdn-cms.f-static.net/uploads/4405437/normal_6015ad57adebc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/545b5708-dcdb-4971-8d2e-3723a9b3967b/kyocera_qualcomm_3g_cdma_phone_hard_reset.pdf
    • https://uploads.strikinglycdn.com/files/2fb57f18-5f27-4759-9587-b41ee510268c/best_picture_settings_for_samsung_uhd_tv_series_6.pdf
    • https://uploads.strikinglycdn.com/files/ae4c7f55-a5d5-48d0-8798-8bcfdcea8968/fuvabevizukozolawoban.pdf
    • https://uploads.strikinglycdn.com/files/3830bdde-29c8-42cf-9f96-eb59fde11812/fezafuxa.pdf
    • https://uploads.strikinglycdn.com/files/4c85293f-e379-404e-9a85-8762fea91221/what_do_gnostics_teach.pdf
    • https://uploads.strikinglycdn.com/files/5c180871-c09b-4d78-830d-979a2f3bb753/vepaloseba.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e962.bin
c6ab8d49326867453e5199046702007304a61af3efea1ba6de10904a36475cf5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE962 5456 bytes
font_01_sfnt_off0000fbad.bin
728555a26d05558bee06b72fb3ea9b17d0d070d616701d60d3a8cbf8023decf6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 11856 bytes