Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f446d411689aa85…

MALICIOUS

PDF

68.8 KB Created: 2020-11-18 10:49:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2fac8079e766b126fa3a6bed79bdd1ec SHA-1: 1ed4f485d2949845021d20ea923d6739f574c341 SHA-256: 6f446d411689aa8568402ce50a188d4d52d69584e2d001ec17d2291bd14b426a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://trafftec.ru/123?utm_term=carta+de+una+desconocida', is flagged as an external URI and has an unknown reputation, suggesting a malicious intent. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or spam distribution mechanism.

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://trafftec.ru/123?utm_term=carta+de+una+desconocida PDF link annotation
    • https://rugazodexozapef.weebly.com/uploads/1/3/4/4/134480570/tinomugudaredoroji.pdfIn PDF document text
    • https://luzejezoroze.weebly.com/uploads/1/3/4/3/134361740/lubeninusukasinosu.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
    • https://uploads.strikinglycdn.com/files/67b4f2f8-80d1-49f8-b7a0-d4cd650cb30a/60278633905.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/53214376646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09fde062-698d-4950-96f3-767db347da5b/kagoxovatagitiribagafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55b77a6e-4fa4-4fd8-bbd8-13976c73533a/how_to_download_your_own_sound_on_tiktok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/087c31c2-ee02-4c22-ae1d-7ac294f9483d/besamuvuxerorivela.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/rarekexexibewafovew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af3b7b07-955c-46f1-bcbc-78803c7a8760/manual_dmv_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d0aa23-c92b-4112-80e8-366cc30bfb31/61722897782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e99261-7d00-4100-baa7-bd135a8718fc/snap_on_mig_welder_ya217a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7c56a37-fd71-47a6-8538-f11d3dac8fdb/kyocera_cs_3500i_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/ryobi_ry10521a_chainsaw_service_manual.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_off0000c0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DF 4808 bytes
SHA-256: 2daf83512966cb9a480b164fa4e706bca09cb23dda3cea4b0d0676619e2d9959
font_01_sfnt_off0000d13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13C 11556 bytes
SHA-256: 1c4bd5842b37fbcfbd5fcdf43fb46e4bdbeeda5ddcde021e6679ba4c43127ead
font_02_sfnt_off0000f6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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