Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac7592a8e97479c…

MALICIOUS

PDF

80.4 KB Created: 2021-04-16 10:40:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e9d747e431c4fd21950e5ddd1e182ca7 SHA-1: 2dd4c8418864f78ad6c047ff792c93269b94226f SHA-256: 8ac7592a8e97479cb2fc50a8c909a1a6a035cdec996c970b69c65dead68e37d6
186 Risk Score

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 6

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=como+hacer+un+plan+de+estudio+para+ni%25C3%25B1os PDF link annotation
    • https://zawiwiguxasawum.weebly.com/uploads/1/3/0/7/130739629/6668041.pdfIn PDF document text
    • https://mifafuriladivu.weebly.com/uploads/1/3/4/7/134733471/1186522.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/GgfWghd/30272796039.pdfIn PDF document text
    • https://fupotepalakeb.weebly.com/uploads/1/3/5/3/135351483/5372892.pdfIn PDF document text
    • https://vafopizinenited.weebly.com/uploads/1/3/4/4/134480139/1957443.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/790413101420yprr.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/cSijije/jirosobom.pdfIn PDF document text
    • http://priz24.site/how_do_you_fill_out_a_blank_check9cw99.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/ggsijjh/xiposurit.pdfIn PDF document text
    • https://basavorulifa.weebly.com/uploads/1/3/4/8/134899730/wovujulumupu.pdfIn PDF document text
    • https://nunoperiv.weebly.com/uploads/1/3/1/8/131856708/niwes.pdfIn PDF document text
    • http://trydouche.xyz/zovelakejiduxerzbol.pdfIn PDF document text
    • http://c-advance.space/60804366289uh6qw.pdfIn PDF document text
    • https://dobabolomibela.weebly.com/uploads/1/3/2/6/132681713/ruvele.pdfIn PDF document text
    • http://joy-todays.online/business_letter_template_multiple_pages8zrq2.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://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_9a173a2931b749fd8c8763949ebdf98a.pdf?index=trueIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_ffef2efbeaf949c7b8fe8ba5cd44992d.pdf?index=trueIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_8c8b4a1d157a4b62ad901880a9524352.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 5428 bytes
SHA-256: fb3f12e2bd617a2d3f9b7ea5f6b7d0444c4e9a52272803b1a6fdd2b2d207c10c
font_01_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 11600 bytes
SHA-256: 67f2164e7bd3d3ca7a70621358cb5e4a9185d48188583efb7d809b2258eba6f2
font_02_sfnt_off0001242b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

Open this report in the interactive analyzer, or submit your own file for analysis.