Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c0190aa09af61d…

MALICIOUS

PDF

86.7 KB Created: 2021-03-23 18:04:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a05ed7bb07def1791439eb3877ee2950 SHA-1: 57e18090da38b92258cf0c68fbf789adf4f00d26 SHA-256: 52c0190aa09af61dce286d5773d128db856e39ed4f8213603a2a9be285bdf0d4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/strik?utm_term=how+to+connect+yas+207 PDF link annotation
    • https://cdn.sqhk.co/ruwopazeg/gfym4CH/fixalililor.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/agcBign/dodge_neon_dashboard_lights_not_working.pdfIn PDF document text
    • https://warodimaziwini.weebly.com/uploads/1/3/4/6/134611971/xaxezopuf_madidikel.pdfIn PDF document text
    • https://weranatowo.weebly.com/uploads/1/3/1/4/131408071/vivosexuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489848/normal_602ae74787af2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475000/normal_60298247b20f7.pdfIn PDF document text
    • https://cdn.sqhk.co/naxusepimosa/bhekJsh/24855826111.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Gijjhq7/vepoxonojimugapotap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454813/normal_604a69aa3fcc3.pdfIn PDF document text
    • https://cdn.sqhk.co/vejurumilef/dajbahg/calculator_app_for_windows_10_free.pdfIn PDF document text
    • https://bebujufexuxiki.weebly.com/uploads/1/3/4/6/134624407/lenudoxami-tisudipe-wexavenexidano.pdfIn PDF document text
    • https://bevereka.weebly.com/uploads/1/3/0/7/130739533/bagezar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://11210a16-d5d1-4e17-93a3-27fbbb12f21b.filesusr.com/ugd/fb658e_ea5232609ae946dbbf5f65ad7d7032af.pdf?index=trueIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_1d8c9b4e60a441c18c5ccfc865c5464b.pdf?index=trueIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_5d62baaa83544146a631f49c366951a4.pdf?index=trueIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_b6732b5361ad43babb99ebd9f79b0fd8.pdf?index=trueIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_6cf2ccb753c44822b1e06fa9866f4c5a.pdf?index=trueIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_9b94dc46f419488ab1ed5430174b8cdb.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_4c56d6bf298b415ab004383ed313d49d.pdf?index=trueIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_46c42e2f38424e7db267eda0297c075c.pdf?index=trueIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_8a0e13550e2149e1a978d164fe0034bb.pdf?index=trueIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_6100cdc6b8254caeb03463b0b16b0fbb.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_96699dfe2b064498b675e409bbc59676.pdf?index=trueIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_05d25610ef85492f8a1c400d2d1e22bd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 4912 bytes
SHA-256: 6b5a002aad610ca624307fba3828e10009cf2cf03911794ff2493207329498f7
font_01_sfnt_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 11304 bytes
SHA-256: 1a3257e669271b7a4233720d4b08aa29fadc021f636e8e85e1bd11bea10a4c04
font_02_sfnt_off00013f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3