Malicious PDF — malware analysis report

Static analysis result for SHA-256 d841599f787dbf36…

MALICIOUS

PDF

86.2 KB Created: 2021-03-07 10:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 41d16559cfc6be6232dcd8b80011c44a SHA-1: 9e10153c4da0b53bcbf8bffcf089222320fdd2c6 SHA-256: d841599f787dbf365240d4d164e397c4e726b0130e5d415ac06beade2987c5be
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=las+escuelas+que+siguen+a+los+chicos+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410731/normal_6035ceb6f3d24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489992/normal_5fe05b3ebe3c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417207/normal_5ffe5391db7b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496204/normal_5fd94fcea7111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_60222710c3384.pdfIn PDF document text
    • http://fredo.run/bodyguard_movie_video_hdkdqjt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455886/normal_6005192fe8e01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445573/normal_5fed5b40b0d61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418185/normal_5ff75a9b2d6a7.pdfIn PDF document text
    • http://helplnstagramoffice.com/kekolalolidafunenisr96m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475215/normal_5fe5cf54afb97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474231/normal_5ff531328d8ab.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/fa53dcdd-b727-4258-b5fb-58697f7cb80b/87718495948.pdfIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_1b96923c580a42e4870442f9c3db511a.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_ddc9187c8d3b4e7aa5a0cb784bc27d66.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78328af2-4b8b-4e68-84df-0370ca275be8/what_is_the_best_chick_fil_a_sauce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8207226-5b64-4ab8-bb10-ad069a4947f4/excel_course_online_microsoft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18d7739c-4ce7-4315-983c-1cdcc80180a4/soleus_air_12_000_btu_ashrae_portable_air_conditioner_with_remote_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b2d5f06-5596-415e-846a-5a8de828570c/gosowogadewenu.pdfIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_ca5b0a1d17f1423aa93ea78698a63361.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_off000111b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B3 5220 bytes
SHA-256: 5488b0f7bad2b66cb0b1c28206b6db9599c37f8030cf1cc1cf7fabe3ba240e91
font_01_sfnt_off0001237d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237D 11828 bytes
SHA-256: 21933eb5ba5ae0c5bad0a78c7055e4b5738652a6359c7d2e3093c35af8b6ac73

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