Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0d162afb7cac52a…

MALICIOUS

PDF

81.8 KB Created: 2021-02-27 23:35:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9bdf3b7e59ce6e6c9a26e5534dd7eadb SHA-1: 100f8893b9c6fb86dc51fd2ec8048b4b99fa0fc3 SHA-256: d0d162afb7cac52a87ff8c6a4b617b2c7f13e877f18ffb00e29c057c62c4a614
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards an attempt to redirect users to potentially malicious content hosted on external sites.

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://seumenha.ru/aws?utm_term=what+is+vanderbilt+assessment+scale PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370540/normal_5fe2c8175d73a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5fef7b4a05172.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482020/normal_5ff03f6752bf2.pdfIn PDF document text
    • https://jibunomo.weebly.com/uploads/1/3/5/3/135348462/mujena.pdfIn PDF document text
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/08000585cff275a.pdfIn PDF document text
    • https://sajofagexureleb.weebly.com/uploads/1/3/4/6/134652103/5974852d6f97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488570/normal_5ff9d525c8fa6.pdfIn PDF document text
    • https://nolulanulupu.weebly.com/uploads/1/3/1/3/131379612/xajene.pdfIn PDF document text
    • http://vopibuxipem.22web.org/56228335352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403266/normal_60209c742db5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/body_parts_worksheet_elementary.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/xonifipamuvoletigasid.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/define_cuneiform_synonym.pdfIn PDF document text
    • http://suwapazuxesara.epizy.com/82363643244.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/xamelupabozawurufivixuw.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/beans_growing_guide_in_kenya.pdfIn PDF document text
    • http://jawigunomuj.epizy.com/38168103984.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/abbyy_flexicapture_sdk.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 5392 bytes
SHA-256: 82aaf9cbb5ec1a7b58680e84fcc94b6c7d0fc2ee95c3721a80cafb3677dceac3
font_01_sfnt_off0001064b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064B 10936 bytes
SHA-256: 3e1f4792f8107e98d034667f247b7e4902e096a4986c3e954abea68969e80912
font_02_sfnt_off00012b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3C 6048 bytes
SHA-256: 0f9ffb01bd7f62da26c8df7dfc1833b5437b9b6d5d046c5faa5e0bbe05dfd95b

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