Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e5343f49fc7e79…

MALICIOUS

PDF

84.3 KB Created: 2021-03-15 21:18:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 591ebc6b35b321f7e660c32b06850593 SHA-1: 988e97fc454d91909e5152eaf8c605a9cd991cf1 SHA-256: 10e5343f49fc7e799cfcd63fe65622c9ba03127622c01e08096d0386313323fe
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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://baarspo.ru/aws?utm_term=the+waverly+hotel+nyc PDF link annotation
    • http://mitimewigupito.mypressonline.com/18261484603.pdfIn PDF document text
    • http://vivabozuna.iblogger.org/jnv_online_form.pdfIn PDF document text
    • http://wutoxurusot.iblogger.org/iop_ceng_application_form.pdfIn PDF document text
    • http://waduresiwiboba.iblogger.org/cambridge_dictionary_of_american_idioms_download.pdfIn PDF document text
    • https://puzifisabu.weebly.com/uploads/1/3/1/3/131378936/72363b7acf6516.pdfIn PDF document text
    • http://bitoxifa.sportsontheweb.net/filumuxenubujopaj.pdfIn PDF document text
    • https://feverawujebuv.weebly.com/uploads/1/3/5/3/135314909/f6835705f47.pdfIn PDF document text
    • https://tinedejoditof.weebly.com/uploads/1/3/5/9/135971312/zexitekowotaru_bebebegigekosu_marunosepu_jalot.pdfIn PDF document text
    • https://pusotovoxidelo.weebly.com/uploads/1/3/1/6/131637553/4ed669e1.pdfIn PDF document text
    • https://deremorukoj.weebly.com/uploads/1/3/4/4/134490203/tasilikagilipub-tinatatisirebax-paxana.pdfIn PDF document text
    • https://tusejefil.weebly.com/uploads/1/3/4/3/134320171/e84d6.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/40ef55e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jibizedatamod.epizy.com/komusipajisefotulo.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/how_to_change_the_time_on_a_norstar_m7310_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66dfe72b-1de1-460b-b17b-88f157b66214/vuxurozufivijisi.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/67490424070.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/structured_cabling_design_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a08e0737-2336-4077-9bdf-057bf1d3ffc4/what_is_the_main_point_of_the_sisyphus_myth.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6F 4912 bytes
SHA-256: afaaa396ae09c902bc8f7c82d0f692bc711d15e0902707c9fffe470f3ec34dbd
font_01_sfnt_off00011e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3F 11268 bytes
SHA-256: bbd92d1caebc028200b8c2f0a66dec23a260fe073234a7a3b7e71894974158e6

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