Malicious PDF — malware analysis report

Static analysis result for SHA-256 770f060a347ce2cb…

MALICIOUS

PDF

81.3 KB Created: 2021-03-31 03:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4934a875731685669ac23840bf1b5d4f SHA-1: 570fee1db740c2bbcf17c143ea0cd439f01c2d63 SHA-256: 770f060a347ce2cb6d9c484fbdae5ccf1aac427fbdf2db6c07db7e25c5a7017f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, pointing to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/wix?keyword=legal+age+of+consent+in+wisconsin+2017 PDF link annotation
    • http://lamanixumerad.mypressonline.com/80677829653.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496592/normal_5ffa50d00892e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_6022d9ff65e96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411918/normal_60433dd27571f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_351177d6860f4c138323724e1d9f0e39.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a9f66e-3392-4187-bc51-b47ed0585838/93100377341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5c2a96e-a761-4f0c-930d-525eff92b567/tazoxofurudaxugamarifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db312d01-e895-4ae5-a1b0-8476732c054b/borevedupavosuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03443088-8bff-4d04-979b-6c2eba58e257/91171876788.pdfIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_59fb6325b74e4b7ba2f462380ff612d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f0314eb-9259-4dc6-a997-9783bab190f1/nunezumevufasotobexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8867a979-e34d-4985-9865-aa370fdb63e9/97176379564.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_945c3046045d4ac882f0b688cf380618.pdf?index=trueIn PDF document text
    • https://f72e0e13-a873-49c5-9cb5-3c2848b8c5b2.filesusr.com/ugd/f8ba4b_65d47bc7d34848edbd3440f2753447cb.pdf?index=trueIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_1bf7469c819343998674a4886567f748.pdf?index=trueIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_412dc228f8e64f4ba85ad6e24888010d.pdf?index=trueIn PDF document text
    • http://dezobod.onlinewebshop.net/binomio_de_newton_exercicios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/185ca677-134a-4dc2-a257-46107bef68ca/tibufar.pdfIn PDF document text
    • https://fea50346-ab34-4b67-843e-90a6383c4983.filesusr.com/ugd/bf678e_095787dc5c6348cf974129a95fa1b01e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cdb62dc-1f32-4fe3-a7c3-b9b5afdf5348/36223625739.pdfIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_5a6d12b1f1f94c71b2a1347a5854de9c.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_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 5392 bytes
SHA-256: 2e3179c13840b5115321ea9138d022b7c0ff03b29afc3c662fdc728a157d33b9
font_01_sfnt_off00011186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11186 11288 bytes
SHA-256: 95b02cde875a074336566fea5739c606b2f18ec68d3c5f8980e3594dc8e189a9