Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2cc521337558e1c…

MALICIOUS

PDF

78.8 KB Created: 2021-03-30 00:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 439202b2f6b12148778af20f075dd39e SHA-1: c2d485a4b441cb5eeec986c23e5b5d38ceacdc69 SHA-256: d2cc521337558e1c42662f2053931548d5818befa3c954095c3049701ce10fd0
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-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://resalured.ru/award?keyword=actinomicosis+pelvica+pdf PDF link annotation
    • https://cdn.sqhk.co/sizozizaj/MhhElig/fubegugej.pdfIn PDF document text
    • http://pomanonorajalam.22web.org/ahmedabad_mirror_epaper_yesterday_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/dYjaIhf/bootstrap_4_cheat_sheet_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/axWiiie/49674458961.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/gjgMSjg/zurepugu.pdfIn PDF document text
    • http://gutufozif.iblogger.org/podegav.pdfIn PDF document text
    • http://mofopafilubo.22web.org/19664172649.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/haYLjgH/heist_bank_clicker_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pimepojuti/gKLgiT3/kuxiru.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/b35de3a2-d4d1-43ad-9efb-014825c3023d/totaline_premier_commercial_programmable_thermostat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4c179b3-6cfc-499d-a2d1-8e3e4bcc5564/bmw_e90_service_engine_soon_reset.pdfIn PDF document text
    • https://f7b0ef4b-317e-4f07-901b-4de91a029b50.filesusr.com/ugd/50f142_900c03e62bc646a98a9eb4ad35b5a501.pdf?index=trueIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_892345bee15d4b83b3d7066b7bfd81ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/38debf9d-da0c-4690-9dd8-b0a906fec708/rilukepewarezosibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b384f95-6400-4d0b-8874-ca913e1ba1f6/jandy_legacy_pool_heater_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82cf2117-015e-4b13-9c5e-ba59d2572b55/zixokiwojubuzunujinobidaz.pdfIn PDF document text
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_ae315b1e46854845a1303dd5c954c9ce.pdf?index=trueIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_bf4b155241b242f68a71d255444f005b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27354e98-7c7d-4863-b6fa-fe9d87995c91/what_is_the_best_keurig_coffee_maker_for_home_use.pdfIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_9afc89c83fdd48f7aad063127694ba5d.pdf?index=trueIn PDF document text
    • http://kirotomi.epizy.com/stocks_that_always_beat_the_market.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11b93c36-e40e-4784-90a9-2cc999708ec7/41972730838.pdfIn 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_off0000f287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF287 5252 bytes
SHA-256: 7cb350b12da0128f1aa08dc7059b7a6ce78845adccd1e3e615f0ea4c96627e41
font_01_sfnt_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 12132 bytes
SHA-256: 535401f55c938598b050ce7c627a1e85a3465abda27723002e4fc22fd83cdc29