Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce1cf3390971007…

MALICIOUS

PDF

74.1 KB Created: 2021-03-09 06:04:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 013597a08afe3af888361bf4ec926278 SHA-1: d7b03bbc021c1af4318fdf9b900b42337d034a01 SHA-256: dce1cf3390971007e2d57a7139de6498920e5a065e12c0e43fb5cf65e2421952
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=challan+no+280+pdf+fillable+format PDF link annotation
    • http://gonifarej.mywebcommunity.org/romeo_juliet_telugu_movie_songs_download.pdfIn PDF document text
    • https://fovivijidilel.weebly.com/uploads/1/3/4/8/134888041/d9d2772.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/ifeAkgh/60515057664.pdfIn PDF document text
    • http://mopexaxurip.getenjoyment.net/lee_child_short_stories.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/literary_devices_worksheet.pdfIn PDF document text
    • https://malojedatev.weebly.com/uploads/1/3/0/8/130813840/8e6eff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403118/normal_602b4a58eee16.pdfIn PDF document text
    • http://pozuvixa.getenjoyment.net/how_much_does_a_life_skills_coach_make.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387582/normal_6046bbb5eba51.pdfIn PDF document text
    • https://posajegodat.weebly.com/uploads/1/3/4/4/134477503/3186367.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/hjBSPii/will_light_brown_cover_orange_hair.pdfIn PDF document text
    • https://xeruterone.weebly.com/uploads/1/3/2/6/132680908/tejumovozax.pdfIn PDF document text
    • https://cdn.sqhk.co/luveruzosu/3WAjhp0/satizurojiparedi.pdfIn PDF document text
    • https://pegupirorig.weebly.com/uploads/1/3/1/4/131406852/kanobef-mijitobijudez-gikozopemawoma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_13037b81baa54990ba40138b9fd69990.pdf?index=trueIn PDF document text
    • https://d668ac4b-7052-46b9-8d0c-7e282d24ced7.filesusr.com/ugd/00fc84_954be038bcfa4d2f995ff1d9c9b55f76.pdf?index=trueIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_f7ad50b4e778459294e38c7a2f398caf.pdf?index=trueIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_dcac3cbdb594437e85d5d671bf227e00.pdf?index=trueIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_8453fafec2214ca3959a1f5f2352ca82.pdf?index=trueIn PDF document text
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_c98cd3d8172e4ee4ae4e9402d6cac8f1.pdf?index=trueIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_13689e91e38e4624956beb85969d15c9.pdf?index=trueIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_4b9674515b364b31bc035700cebecec4.pdf?index=trueIn PDF document text
    • http://dipagepe.atwebpages.com/jadual_caruman_kwsp_2020.pdfIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_49c28992042d4f9da7cba88653b984c9.pdf?index=trueIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_be53faefe8ed40a39775fdb4340decfa.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_off0000e52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52A 5616 bytes
SHA-256: 8b94a17d1f87eb368cb2df63832bacdfbd2e2b5c6948b667a83c083b0f5cde7e
font_01_sfnt_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 10124 bytes
SHA-256: fce31a45e8dcf9b40967c5f325292704c571034e34d8b6cf6b144263da4e87a7