Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5e9c4d1b294df4…

MALICIOUS

PDF

81.2 KB Created: 2021-03-18 19:10:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 789e74e9394fcdce7b19dffa396915d5 SHA-1: ee877e621858bc70c54c3169e07c6daf9781f888 SHA-256: cd5e9c4d1b294df4d6819cfa7a62bc03e8844b7ad201945cec68cea253587c2d
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 0.9992

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://crophysi.ru/strik?utm_term=will+stretching+make+me+flexible PDF link annotation
    • http://new-volosi.ru/3749881770891xc.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/how_many_days_paternity_leave_in_us.pdfIn PDF document text
    • http://wegoluxetas.scienceontheweb.net/nesumuzaf.pdfIn PDF document text
    • http://trastqort.online/43857639637ow9r5.pdfIn PDF document text
    • http://gotexewadegu.iblogger.org/veera_abhimanyu_tamil_full_movie_free.pdfIn PDF document text
    • http://leledup.mypressonline.com/what_are_some_good_time_management_techniques.pdfIn PDF document text
    • http://art-practice.org/1945411454x9r66.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://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_b2cd1c95dfbc46e8b6d1b393af544759.pdf?index=trueIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_bcc2e1ecf1d947ef871b8bea5457ae51.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9670ad7b-e6b6-4bca-96bd-0ca159c64983/pibesewiso.pdfIn PDF document text
    • http://toramowajo.epizy.com/pikofomejo.pdfIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_2fafe3c733dc46908f3305404308bbd9.pdf?index=trueIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_857c71b4bfcf408fb1d4d4a317c0b7e9.pdf?index=trueIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_ad42b05e85ff4f07bb7c526f025a2ebe.pdf?index=trueIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_a5694ba6bc884e0e8c33d472db9264c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/351ae33e-d863-47e8-a326-6234fe049f1e/migapudojawoxaxi.pdfIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_bb0aeb74f2024d3da30f6c2ca46f9629.pdf?index=trueIn PDF document text
    • http://guseboses.atwebpages.com/99660469260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb15bab-b98f-47ea-b6b3-c7e299c14a80/53375769860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a18092c-d236-4039-b4ab-8f8bf864ac12/sig_sauer_p229_legion_10_round_magazine.pdfIn PDF document text
    • http://lopaxoreje.rf.gd/the_shape_of_things_book_neil_labute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7749298-c0bd-4d21-b9d5-4662668f13e0/89290836650.pdfIn PDF document text
    • https://6674166f-eb58-46b1-9d38-a528bc95e02c.filesusr.com/ugd/e38d8e_a4f00ec6d0e24d31a74fe3fc563b244f.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_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 5256 bytes
SHA-256: feda73419f83c517d2a24b2cee837bba83a89d39c2f44e6227bb24b0899e3627
font_01_sfnt_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 10616 bytes
SHA-256: 3fdee49ff961eff31bbc898b030b7e73bfe12e849202a495d5d804b8b5a788c9
font_02_sfnt_off0001293b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3