Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cac136952636ee4…

MALICIOUS

PDF

87.7 KB Created: 2021-05-24 17:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d483d5ff4777fef1a0d472fac8d3f63a SHA-1: 57e589d4672beae5a824f6346d087b8633f210dc SHA-256: 8cac136952636ee4cd6f285c9a8e6e5f6662786fc7d4430f0a94ef68a2116e28
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 0.9997

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://jottigo.ru/strik?utm_term=liftmaster+41a5021+manual PDF link annotation
    • https://resagivet.weebly.com/uploads/1/3/1/3/131383325/5cb3b457e.pdfIn PDF document text
    • https://sutuvawubu.weebly.com/uploads/1/3/6/0/136055635/lesejedovelemof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366397/normal_5ffcabf45d158.pdfIn PDF document text
    • https://nirefuriwubava.weebly.com/uploads/1/3/1/6/131637308/7357925.pdfIn PDF document text
    • https://peletawipimo.weebly.com/uploads/1/3/4/4/134444154/ef7e27c83892.pdfIn PDF document text
    • https://dugigexufewe.weebly.com/uploads/1/3/4/3/134353006/vufukoterudodat_dadodunev.pdfIn PDF document text
    • https://posuzelivoj.weebly.com/uploads/1/3/4/8/134869480/ranofagodepik-javiruvupuz-fonofub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408989/normal_5fed6fbab9aa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388052/normal_60261fa5d5e5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372104/normal_60015cbe4892d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445114/normal_5fed213fda70c.pdfIn PDF document text
    • https://pabidiwamudobav.weebly.com/uploads/1/3/5/2/135299897/cd509fc6c8388c1.pdfIn PDF document text
    • https://vitumiwoz.weebly.com/uploads/1/3/4/6/134697216/b71faf5edf57e.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/ce84d021-853c-4d15-bc00-6c2a1ed79ff6/how_to_use_braun_thermoscan_7_ear_thermometer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edf44ddc-5e11-4308-8aa4-d39b6b347754/3978205351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/805c855b-3ba8-4e53-8f58-2033b7600d3e/john_deere_7000_planter_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb2f50e-3c5b-4f59-9948-e5c4edde412b/how_can_i_know_if_someone_is_using_my_facebook_account.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a087992c-1013-452a-858d-7230f6efef97/is_jack_reacher_2_on_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53d8088f-1d70-47c4-917f-5d454d5cd460/how_long_is_ruud_furnace_warranty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e7f0c47-d3da-4e5c-a4b7-a93d564ccc6e/uppababy_vista_2_seat_configurations.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
    • 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_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 5392 bytes
SHA-256: 9bca337436a8999b1c7e7dafb6536c7670d21e7e056c5ce3cfa19fc6644b742a
font_01_sfnt_off00011353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11353 11840 bytes
SHA-256: 1e8050b016039e2d9f7e010e4c780f8df7424bca19a870d22dc2773c8682ed46
font_02_sfnt_off00013aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAA 16108 bytes
SHA-256: 59bd4f7d2e08d06ff8a483dd3a89e5a344457b33747c9a7cfc082607f5cb950d