Malicious PDF — malware analysis report

Static analysis result for SHA-256 9913b15918c98ccd…

MALICIOUS

PDF

91.2 KB Created: 2021-03-05 09:53:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: b8398444ea24a292e23ce3599903e7ee SHA-1: eb8a125a6c32677863548ee84ac085cf00dc5211 SHA-256: 9913b15918c98ccd0ff0b41360d7f99b2012c1bb61aa354e8f530451127069f0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'Grady twins quotes' and is generated by wkhtmltopdf, which can be used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/aws?utm_term=grady+twins+quotes PDF link annotation
    • http://ropufogesuzazeg.iblogger.org/rosavaxugez.pdfIn PDF document text
    • http://nuxagoliwanep.22web.org/6591351.pdfIn PDF document text
    • http://lefefegibilapo.22web.org/intime_handle_timesheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/angry_birds_2_mod_apk_without_obb.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_b3eb41d274f44b6694d0c90230feed36.pdf?index=trueIn PDF document text
    • http://tezuzatarezoz.epizy.com/alternative_hypothesis_example.pdfIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_ef2242a692864cd5b4592412e6771888.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e61539a8-175f-4e11-a8fc-26fd616b4f80/76563178954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cf1bdfd-f981-473c-b56a-a02624586978/menoditibuburupenajuritaj.pdfIn PDF document text
    • http://ravojetejevigim.epizy.com/american_werewolf_in_london_movie.pdfIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_00232bf112d144a3b0399fec0bfa6ed5.pdf?index=trueIn PDF document text
    • http://vufebadavoga.epizy.com/guided_transmission_media_in_computer_networks_ppt.pdfIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_7b6f0a03486042a7a269ae642ef27036.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitatotol/quiz_astronomie.pdfIn PDF document text
    • http://tisigivikevutik.rf.gd/lojusufeli.pdfIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_4349a92038f6403babf44beaa548de5d.pdf?index=trueIn PDF document text
    • http://jozorawoma.rf.gd/how_to_learn_tables_in_vedic_maths.pdfIn PDF document text
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_fa295032c60d40208e54b30ad19be4bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2bf2e1-85c2-4c1a-922e-5bbdc98b7aba/why_should_you_follow_school_rules.pdfIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_9ddd003055d34f2393985769aef2eba9.pdf?index=trueIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_8cdba7a849e54f0ca2f6b1178848c823.pdf?index=trueIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_c924b7fb8a2e4ee4a10d2e53b97a8a80.pdf?index=trueIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_811ba72bdf84454aa1f8d0b3cb231bb2.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_off00012a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6A 5136 bytes
SHA-256: e6d509878c5afd6b92fb180abe011fcac2e293246fe9e9840cc07c13729b2d5e
font_01_sfnt_off00013c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C03 10400 bytes
SHA-256: cd92d36bf93218e56338fd9a8377b382c8059490ee1e9c9a3f6c950efc7d5dbb

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