Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3e354c4747de76…

MALICIOUS

PDF

110.6 KB Created: 2021-04-04 22:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 152b64c91b1c844752d1004146fe54e4 SHA-1: 1f1f96e83b508b9b54d915442a0fb037b91ddd50 SHA-256: 2a3e354c4747de7671658d7ec9650a27c969baa23d247852fee550b1ac718473
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 0.9995

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://jacksth.ru/strik?utm_term=why+did+my+backup+camera+stop+working PDF link annotation
    • http://zarojodazo.22web.org/apprendre_francais_en.pdfIn PDF document text
    • https://kufurana.weebly.com/uploads/1/3/1/4/131482954/4669639.pdfIn PDF document text
    • https://jemogofeti.weebly.com/uploads/1/3/4/0/134042608/kuzunuvexuri.pdfIn PDF document text
    • https://wufowidujexo.weebly.com/uploads/1/3/5/2/135293423/03df689aac7ef2.pdfIn PDF document text
    • https://zidifupo.weebly.com/uploads/1/3/4/4/134475425/02f927de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_811f3dfcfb0d426aa9173181a996c44f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapivegek/xexurijizowa.pdfIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_867557f805e44217ad1e11d26335716b.pdf?index=trueIn PDF document text
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_e6917b4d540442b79e284145b9ae5f4a.pdf?index=trueIn PDF document text
    • http://xukitekebuza.epizy.com/iifl_wealth_report.pdfIn PDF document text
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_1c7586841b1f4df2bcc38e84790b5595.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_8d08e62aaa16472baea96cb28671bac3.pdf?index=trueIn PDF document text
    • https://8ea4a4fb-2859-49e6-8c89-66ed49166bb4.filesusr.com/ugd/0088c1_29665f85687947029e373432aa847fdc.pdf?index=trueIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_b052f3d7a2c2432481dd658fec755b21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/roxawo/zezesatuxajitalozu.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_79186843c1884f0e87d8fccf6e325e15.pdf?index=trueIn PDF document text
    • https://04fc2a56-3ca8-4b90-bfe8-b05f9e7ed3d8.filesusr.com/ugd/51e9d0_a034355f304a46da9ec21976a9e457df.pdf?index=trueIn PDF document text
    • https://fb53c359-4dd6-44fc-abb0-22967ff398eb.filesusr.com/ugd/5899d5_6ff96e3d862945ddbfcdd5acdc31bd30.pdf?index=trueIn PDF document text
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_96306aea843b4155bd0517e61d54b131.pdf?index=trueIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_c1620a41d2094076a05bf4d38d065044.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/69978971396.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/75767369001.pdfIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_8aecee1cc1c54647a03e09d8f17fa42a.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_off00016e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E98 5864 bytes
SHA-256: be2682cee52fec7dc4c5cce37d5d202c67929f1420a9dbd0739c8828376267d2
font_01_sfnt_off00018281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18281 11888 bytes
SHA-256: 01036129cbe2434572bfaa774d04699c3cc447fb91cdb9b58359c3788919c9a9