Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1665e226b89447…

MALICIOUS

PDF

69.0 KB Created: 2020-11-10 07:43:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b48642d128be8cfa14bb8fa5caf865bd SHA-1: b7de7d2c8a2ddded4fd2eba9da41d63adfa15189 SHA-256: da1665e226b89447685960a8df60ee6281596910dce259c3066e5c2b2150b660
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of embedded URLs, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host a large number of external links, potentially for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the presence of numerous links and the malicious verdict strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/aws?keyword=golden+claw+crab In PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/lakepurisemojiwap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_5f8c6e1af1c85.pdfIn PDF document text
    • https://mekukirofex.weebly.com/uploads/1/3/4/5/134589797/9b0fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377925/normal_5fa9e7ff105d3.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/c9ff999a.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/75bb843a-6a98-4ce8-b211-9d7c651b8072/loronuzeli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df49392-3979-4c8f-8ce7-3565d8ac3372/56619062857.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/41780291703.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/47807216160.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/difference_between_shielded_and_unshielded_twisted_pair_cable.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/tax_return_calculator_2020_taxact.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa40d0ad-2fb4-4458-83b6-ee8d31cb673d/rilifovokewofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1c2e851-3f1e-4f81-8ad0-3a2be3670d3e/zopubamume.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/laboratory_instruments.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_off0000ceba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBA 5016 bytes
SHA-256: a47f5d6af82d82d13b692cfe29e1567919785c0f9b06cf04c1f012cbf6f4e79f
font_01_sfnt_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 11564 bytes
SHA-256: c9a63aef0d428b561d7e0d5c795ab802ea4c68c81dad471b132425a9b8ae972d

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