Malicious PDF — malware analysis report

Static analysis result for SHA-256 802878bf64126405…

MALICIOUS

PDF

91.9 KB Created: 2021-03-10 12:53:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b9dd28b44b1477d9a8caf38e243fb739 SHA-1: 953cd3bce2be2fa1076be3be4c16ea9f9b8c7bc6 SHA-256: 802878bf6412640597cffdcb5648beaeb75008b1766a63d2fa92d3bdf8dcb6f5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the heuristic firings related to SEO link farms point towards an attempt to obfuscate the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://xajibur.ru/123?utm_term=investment+interest+calculator+spreadsheet PDF link annotation
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/mikikabizuronuvoja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475725/normal_6006b8757feb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412195/normal_5fcf8d8bbc714.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374860/normal_6000199ca96e7.pdfIn PDF document text
    • https://vitigamonewus.weebly.com/uploads/1/3/1/4/131406732/zajolires.pdfIn PDF document text
    • http://levotavo.scienceontheweb.net/43117566580.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/icietoE/ns_express_courier_tracking.pdfIn PDF document text
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/nujuvowagalemifikaj.pdfIn PDF document text
    • https://cdn.sqhk.co/vumatoxikom/jeggicb/zojukodijogodajuboreda.pdfIn PDF document text
    • https://laximazerafa.weebly.com/uploads/1/3/4/2/134235816/xasogikedimisapol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451227/normal_5ff0228087e61.pdfIn PDF document text
    • https://cdn.sqhk.co/vutowogipu/oejjzHa/54320052864.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bajupigirosinaf.atwebpages.com/antonyms_and_synonyms_list_with_telugu_meaning_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35a454db-5c30-4ae0-9a80-1fcadea8d502/murokuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf3ce672-ac94-4c72-b91f-67b8c795453e/nulanatasawuxutilofon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab410e30-3859-4677-b7e3-f139f2273954/59669550982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/832c7bc1-03b2-4ba8-974d-91372bc1174f/braun_thermoscan_7_owners_manual.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/reddit_cyberpunk_2077_ps4_graphics.pdfIn PDF document text
    • http://pulitisagot.atwebpages.com/install_driver_brother_mfc-8950dw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fd4fa86-27f4-41c6-8d61-4edac730a0f8/39180421256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0bb4595-4643-4ee0-bfcc-9686f2017c2c/how_to_write_a_6_paragraph_argumentative_essay.pdfIn PDF document text
    • http://gajamozaxekega.atwebpages.com/assemblage_bois_menuiserie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6170faa-9039-4ae6-b045-d3df78a2a196/73024739416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c968e8d6-782d-413b-97f0-701e54584896/how_to_rig_a_fly_fishing_rod.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 5192 bytes
SHA-256: 98fb8392165a32d2702020b6d6797bdcb872762ba6cde1d2abc0b75e6cdfc330
font_01_sfnt_off00012f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1D 10656 bytes
SHA-256: 3d709cbd96659f2213aa669044d53ceb05fe33a3f8b87ffc7bf203c794168934
font_02_sfnt_off00015378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15378 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e