Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c134800972ff4b…

MALICIOUS

PDF

82.7 KB Created: 2021-03-24 04:30:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d81d98fe65362836f0e2abb7432e89e6 SHA-1: 307e13055a155a1c769aefecdf10b5a2ed10dd7a SHA-256: 89c134800972ff4b071850066663b786e231456d6085bee04fd9c7d5e2257e34
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 0.9996

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://zajinet.ru/wix?keyword=how+to+delete+auto+backup+photos+in+picasa PDF link annotation
    • http://experiment.website/47168159248u083j.pdfIn PDF document text
    • http://goodshopsales.xyz/metro_2033_redux_librarian_walkthroughhskhz.pdfIn PDF document text
    • http://yozi.store/protibad_bengali_movie_full_hd960t4.pdfIn PDF document text
    • http://daliadiago.com/furowab5r4a2.pdfIn PDF document text
    • http://cardioactiveufficiale.site/whats_a_good_safety_slogannick7.pdfIn PDF document text
    • http://flymoney.net/country_2_step_rap_songjhv89.pdfIn PDF document text
    • http://phrensy.co/learn_hindi_to_englishz8mh1.pdfIn PDF document text
    • http://befigter.xyz/what_is_the_best_harry_potter_booksnrhgi.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/797f9371-80a6-4e62-ac27-c73402fa100a/58398617474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5af672fd-a453-410e-8d60-b4fbf3829f03/femuboxamabumifizikexif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e044187-0ab7-4fa1-8b6d-415d565e610d/who_took_jaycee_dugard.pdfIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_ae28c8c418204c84a57db52f2f367d12.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/766d7f34-4a60-4096-88ce-2cb4d811e727/gidedovanazorubonisam.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/lozewabepiditafener.pdfIn PDF document text
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_26c3f3e599fc41e5a6c2cde0bd30d318.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/567819a0-ba39-4431-8f9a-dfbe419daa00/sat_writing_and_language_practice_test_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45363c44-ec6e-40aa-b94c-c70563cc600f/varobagurarezozur.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_3b0747f23ee34649ab7bfd3bd85fc802.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/78195162915.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_3baa047b9e6e4fd5aaead28a9288a415.pdf?index=trueIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_8ac4753aa56d4605a68cb3f3dc62f26c.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 5324 bytes
SHA-256: cd451cb2c42e12adcbb70cab259ddd3c125f86c41f068f02650ff0e1f801c279
font_01_sfnt_off000101d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 10940 bytes
SHA-256: 81afe15478d0014d1841f98728f069ae7db30925e47c7be50b8e82db35710373
font_02_sfnt_off00012776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12776 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e