Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1ff70ff6258a4f…

MALICIOUS

PDF

80.0 KB Created: 2021-03-29 01:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 771af5d55cf91ecad1231d71d094bf1c SHA-1: 42c1f026b53452665d844aebf44cc02728cc1792 SHA-256: 3b1ff70ff6258a4f82edbb824adf1e9ada18b5e04bec9c9b09c89c278b95d596
156 Risk Score

Malware Insights

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

This PDF file is classified as malicious due to its extensive use of external links, characteristic of a link farm designed to direct users to potentially harmful websites. The heuristic 'PDF_SEO_LINK_FARM' and the high ML score strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a phishing or content-scraping operation, likely attempting to exploit users seeking information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/award?keyword=critical+thinking+questions+and+answers+pdf
    • http://bikelumonekodex.mygamesonline.org/voxijixafurosiloninit.pdf
    • http://zazorin.scienceontheweb.net/76458475381.pdf
    • http://xasedogamif.mypressonline.com/la_anemia_en_nios.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_a23c833a9fbb4d62a7efad64f761a226.pdf?index=true
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_d7e70f0a9d6e4f9f8cccf638a5004f35.pdf?index=true
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_80bf052af46346409a4b848a5ceb3dc5.pdf?index=true
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_ef0dd5fda31d45a2841d45db5b0bd3c2.pdf?index=true
    • https://s3.amazonaws.com/xukonakefules/gorudenenegaw.pdf
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_9c56f6116a134374ab981a39850acf95.pdf?index=true
    • https://s3.amazonaws.com/salade/how_to_install_a_tankless_hot_water_heater_in_an_rv.pdf
    • https://uploads.strikinglycdn.com/files/66f52662-fe9a-41c2-86c5-385936a32d8e/in_a_dark_dark_wood_movie_cast.pdf
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_9379355fb4394b0b9d92c5add6b4e7ee.pdf?index=true
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_49052bb8f21d48298678356b67d7012e.pdf?index=true
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_1343b7ba0c7f4f85bd476782d771fc50.pdf?index=true
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_d2afa55c99164382ba148e4d0ae31d64.pdf?index=true
    • https://bee08bb6-d8c1-4cc5-89f0-d6ac88a4f64a.filesusr.com/ugd/8b8a1f_2e51eec53fe24bcfaedd6d9af05ec8c0.pdf?index=true
    • http://kifesafijupesob.onlinewebshop.net/gobafanumotaju.pdf
    • https://s3.amazonaws.com/zukogi/what_kind_of_jobs_are_in_information_technology.pdf
    • https://uploads.strikinglycdn.com/files/3b678dc8-3c5f-4218-a66e-223bd70c6bc3/josuloroxenipufus.pdf
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_08c20a47043e4ec29867aec0e6d4e447.pdf?index=true
    • https://s3.amazonaws.com/ditiruz/49549124676.pdf
    • https://uploads.strikinglycdn.com/files/c640ae49-05f0-420a-8831-fd29b36f8945/python_tutorial_2020.pdf
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_164eaf1784734fed8a3b720cf8cd87ce.pdf?index=true
    • https://s3.amazonaws.com/somamere/innerworth_mind_over_markets.pdf
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_33cedb6f66a943c7b975234ed3ed5f73.pdf?index=true
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_b03577b52d7f4d279a497f4e3e45b463.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f895.bin
0ab6998f5b90bfff319cdd76c3677bd1b3ee37e83a3208ec5508a747ed923abf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF895 5604 bytes
font_01_sfnt_off00010ba5.bin
57daa53b8ee5ffdf44c55753c859a4f1c6cd7c1f565a86e30f3a1350b7782866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA5 10844 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.