Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9a3b76f75bd8e4…

MALICIOUS

PDF

86.8 KB Created: 2021-03-22 05:17:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01ca832d27ce4e270b15bc3500341f13 SHA-1: c9d0dc4ce45f2503ae4597bf1a354280b4619229 SHA-256: 5f9a3b76f75bd8e46aa785650a20459708357cfb82b8722a12fc6ac7d96e5b63
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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 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://xezojetit.ru/award?keyword=architecture+of+happiness+book+pdf PDF link annotation
    • https://viwoseloza.weebly.com/uploads/1/3/4/8/134861971/1727366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497109/normal_60313217bea10.pdfIn PDF document text
    • https://mipikarekegimo.weebly.com/uploads/1/3/1/6/131606279/2086587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490256/normal_6055230e7dc49.pdfIn PDF document text
    • https://xugoxokolo.weebly.com/uploads/1/3/5/3/135392162/1208976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499999/normal_6044f72bca6f1.pdfIn PDF document text
    • https://rujurujubawupof.weebly.com/uploads/1/3/0/9/130969172/kopibiv_mowevivagopeba_wuroxona_tijuxekup.pdfIn PDF document text
    • https://gorogonib.weebly.com/uploads/1/3/0/7/130775466/fejaxomegixavawidud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473640/normal_5fecafa7238ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480594/normal_604ba3f6cb360.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/4d8ea5fc-4277-4379-b89d-499329bcddab/skyrim_skyui_favorites_menu_not_working.pdfIn PDF document text
    • https://f653e438-ced9-461e-a5db-197b8397358f.filesusr.com/ugd/debdc1_cf019ca2f475487786d38132ae581edb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zasepo/arteriovenous_malformation_libre_pathology.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/17733249105.pdfIn PDF document text
    • https://db6d3479-2aeb-4a59-914c-1f55c48648c8.filesusr.com/ugd/9f5433_c5e939f318af494b94d099273ecb2ee8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f64e801e-bb26-4c88-afea-2ff96cd3a331/machine_learning_vs_artificial_intelligence_vs_deep_learning.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/ktvn_weather_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91c56442-a225-4de3-988e-ea494ca432da/black_and_decker_lawn_mower_replacement_blades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2765ffb7-3089-40da-8267-68255f5e2ded/pofeloximizigusugesefiwi.pdfIn PDF document text
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_677c426933f2463289013250bbfbabad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0cf7af8-c5b8-4021-af20-5852e56615c0/how_to_replace_kenmore_80_series_agitator_dogs.pdfIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_b9a535290fbb4601ad12e534d28b4857.pdf?index=trueIn PDF document text
    • http://daraboregab.epizy.com/35889179279.pdfIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_bc63f62d86b64652a449797545c4a570.pdf?index=trueIn PDF document text
    • http://najorenowodume.epizy.com/four_4s_answers_18.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001136c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 5404 bytes
SHA-256: acd60db8ed2257c2a7bb2ef197a7d4090f421a849264ac59d59a8194d6787a13
font_01_sfnt_off000125c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C0 11728 bytes
SHA-256: 86e9f28cd433c37062327fe2d6037cba23e7577997c739f514ac721effdbaa0f