Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbada031f8885f8…

MALICIOUS

PDF

106.5 KB Created: 2021-03-02 02:16:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b17de6115d80e7c2951747b35c21504c SHA-1: 1b4fa5966c7890944f5e67416e9b064428be6b48 SHA-256: 7cbada031f8885f8c383864815112727e63e5247046e4f2ec2afb84d484bb15d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, indicating a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=upright+26n+scissor+lift+manual PDF link annotation
    • https://cdn.sqhk.co/wudawagirus/eFggjcn/nezonaloju.pdfIn PDF document text
    • http://byseles.xyz/crossfit_programming_guidere3e5.pdfIn PDF document text
    • https://zerasogamonan.weebly.com/uploads/1/3/0/7/130775055/pudezomakozimuribogi.pdfIn PDF document text
    • https://wojawodexof.weebly.com/uploads/1/3/4/6/134673733/buwafizovazos.pdfIn PDF document text
    • http://redpandarecycling.com/kufodokulejuxedizurem0xbm.pdfIn PDF document text
    • http://trylait.club/viper_3105v_remotey74vo.pdfIn PDF document text
    • https://jeluvuxibobuna.weebly.com/uploads/1/3/4/0/134017570/484962.pdfIn PDF document text
    • http://fsbsiod.com/how_to_make_a_small_fridge_colderg3ybw.pdfIn PDF document text
    • https://cdn.sqhk.co/jawosuzexe/ljjTL9f/realistic_off_road_extreme_truck_driving_simulator_3d.pdfIn PDF document text
    • https://sajinekud.weebly.com/uploads/1/3/5/3/135391411/dekik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_60230b66a2868.pdfIn PDF document text
    • https://nulazonale.weebly.com/uploads/1/3/4/8/134892754/61383da313ef198.pdfIn PDF document text
    • http://ilkertr.shop/convert_to_excel_smallz3v1i.pdfIn PDF document text
    • https://buvupoxiku.weebly.com/uploads/1/3/4/3/134329971/4282f44aeba820.pdfIn PDF document text
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/8848671.pdfIn PDF document text
    • https://sidopaxabu.weebly.com/uploads/1/3/1/3/131398246/6407534.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000157d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D6 5708 bytes
SHA-256: 321ba1dc01d12afc5d126f0f64478ec7211d7a5ee74020b0dbe44dd16e4b8be5
font_01_sfnt_off00016b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B22 16160 bytes
SHA-256: 30f49e84fa4ee154be5374710915c246ee61078591cff62351f94b6e8cd55b25

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