Malicious PDF — malware analysis report

Static analysis result for SHA-256 965c70f0f87cdbe0…

MALICIOUS

PDF

78.1 KB Created: 2021-03-22 17:49:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 746021573b15362da5f341136a471f22 SHA-1: 1bfe3f26ff95272de826a59c35bfb722029edb0e SHA-256: 965c70f0f87cdbe0d5912e2b31097c4242bfeb0d78f1b6604b0e0358168abca3
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with 25 distinct links pointing to 22 different hosts, many of which appear to be disposable or low-reputation. The primary purpose seems to be directing users to external websites, such as 'xezojetit.ru', likely for malicious content delivery or phishing. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://xezojetit.ru/award?keyword=google+analytics+certification+questions+and+answers+pdf PDF link annotation
    • http://bomisedoxu.mywebcommunity.org/xiwukizodi.pdfIn PDF document text
    • https://gulekizusivo.weebly.com/uploads/1/3/5/3/135392766/3694604.pdfIn PDF document text
    • https://xiwulugizasu.weebly.com/uploads/1/3/2/7/132741433/02dc1e84.pdfIn PDF document text
    • https://vulabomanuxuw.weebly.com/uploads/1/3/4/8/134857085/furuvaxesopox.pdfIn PDF document text
    • https://domekemukud.weebly.com/uploads/1/3/5/3/135327345/xipoz_lukam.pdfIn PDF document text
    • https://toxodomof.weebly.com/uploads/1/3/1/3/131384531/4983941.pdfIn PDF document text
    • http://nuzarekuzugav.mypressonline.com/27549468466.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/36584491991.pdfIn PDF document text
    • https://fukekagike.weebly.com/uploads/1/3/4/5/134587407/ff7c9442bbcd86.pdfIn PDF document text
    • http://nobukuxokosiga.mypressonline.com/bisowajetubegejalawes.pdfIn PDF document text
    • https://getenulezawo.weebly.com/uploads/1/3/4/8/134897364/4623750.pdfIn PDF document text
    • https://noriledefokotox.weebly.com/uploads/1/3/0/7/130739853/bitofasabez_novoronapelaku_wafafelazoze.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/30421536723.pdfIn PDF document text
    • https://tokunebejuz.weebly.com/uploads/1/3/4/3/134323577/rilanogav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_27670079d0614ab691fc2ccb077b2e28.pdf?index=trueIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_745ba12329c743308b186fc19d6f55ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebisop/how_to_put_a_drive_belt_on_a_snapper_riding_lawn_mower.pdfIn PDF document text
    • http://nuzikenevizut.onlinewebshop.net/40400030021.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/cisco_catalyst_3750-_x_fiber_switch_datasheet.pdfIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_156ad28fa91b47328327d7c067aaa51d.pdf?index=trueIn PDF document text
    • http://nogafojomor.onlinewebshop.net/amazon_affiliate_niche_sites_the_complete_guide.pdfIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_60a7859ca00147af8508cd2434701299.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/my_dish_remote_volume_stopped_working.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/16302120788.pdfIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_55050dcf469549a5bad3481e26a43da4.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_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 5676 bytes
SHA-256: 371295b7b5a7659cebf61a91800d2269bf49d667611d700d9829a8942df47747
font_01_sfnt_off0001028d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028D 11168 bytes
SHA-256: d97ff13d949b206ed23898807f041e433131358d9112626ca903809813e9ae1b

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