Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb9a6cb6a332120…

MALICIOUS

PDF

82.5 KB Created: 2021-04-08 03:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0d6e905e3518ffaa9510613fa918ef77 SHA-1: 35208bf797aeee7c10cfd4129afce72e36d998e4 SHA-256: 5eb9a6cb6a332120fb6939c876bfe20f80dae6ecbf2218b8be411c36b65599c6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a significant portion pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure and embedded URLs point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/123?utm_term=large+mouse+cursor PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4530868/normal_5fff0e3b911cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367646/normal_5fcf1ce15a9c3.pdfIn PDF document text
    • http://vukabakoxipus.22web.org/suguriwapo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393908/normal_5feea27deaa7b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_4502f10ae3ce4fb3bd4833a805efd0eb.pdf?index=trueIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_a1c40b0122584a1ca18c048d76cf05af.pdf?index=trueIn PDF document text
    • http://joxepivebafugig.epizy.com/11270951127.pdfIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_297273a2408e498280674e881fe82b96.pdf?index=trueIn PDF document text
    • http://digaruwuw.rf.gd/jebodu.pdfIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_9ee4d2a1578c44699443970a5ccae125.pdf?index=trueIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_5aa124c055884c4aa6cfe653d7b3a4f5.pdf?index=trueIn PDF document text
    • https://949217f6-ecfc-4a1b-8806-967b2a145102.filesusr.com/ugd/b08fd2_39730f30b9fa44f4a4912cb740f08cae.pdf?index=trueIn PDF document text
    • https://05b56818-8b0b-4484-a411-4f1234233f1c.filesusr.com/ugd/e49726_621153e188d64da2b6dcb2b5f4b66155.pdf?index=trueIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_aa751db39aac496988822172eb75355a.pdf?index=trueIn PDF document text
    • https://8458b573-1d6d-478c-912c-b10a972f31df.filesusr.com/ugd/150112_110ef3e098f54859b1cf8b5e6baf6433.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/044b5f24-5c12-416f-a17b-8bc091f0863a/18783543752.pdfIn PDF document text
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_31985bc14b2b43eab3a091d8ef2b3db7.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_89a9d78c748a42b1b104a2c630bdb756.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39365df6-e8ca-4d19-bbf3-673a8c10dcc1/coldest_city_in_us_average.pdfIn PDF document text
    • https://1e35b969-1f99-48dc-8aa8-d0fb9638bdc8.filesusr.com/ugd/970baa_f56f6e4ccdf74d4faa3b68c474b4b0c6.pdf?index=trueIn PDF document text
    • http://vidofebusezix.epizy.com/delevoda.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_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 5028 bytes
SHA-256: b3fb9e6462994554d839698285810fb31a67d4ab126029075b707a15363f8912
font_01_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 11328 bytes
SHA-256: 5e1e816b71ae15679d6131457d74c9d12cde9a700edd5762515e82d7837f3185
font_02_sfnt_off0001276c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276C 16200 bytes
SHA-256: 68a754e1e341727380d49fe71f8a1059b8562488d2a3f9167d15a5c02c25e29b

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