Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7f257ca6bbf013…

MALICIOUS

PDF

88.5 KB Created: 2021-05-13 12:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fdc85c4a355fa4a2d1fe9782d694687b SHA-1: d5d09f985d26900026b1bca968b37c4e3aadb39e SHA-256: 3d7f257ca6bbf0133856753ee70510bd149ee52a07e81151d876e6d012e83743
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9990

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 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/strik?utm_term=how+to+help+knee+pain+in+bed PDF link annotation
    • http://gowanenutik.mypressonline.com/how_to_reverse_traxxas_tq_steering.pdfIn PDF document text
    • http://insta-sale.site/group_theory_applications_abstract_algebra4gl9l.pdfIn PDF document text
    • http://kigumelez.medianewsonline.com/6799448822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485012/normal_601a258e0e96c.pdfIn PDF document text
    • http://academic-club.ru/zafowajikeczhrf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403822/normal_5fe92a8b1b5a2.pdfIn PDF document text
    • http://123dutch.com/zelokozuxororot6rhg8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483365/normal_605cb2a6c195a.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/48274241325.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://af6bd0e1-9fb2-4c52-b6e5-df6188d17e94.filesusr.com/ugd/771d18_be88825da017451ea02c810c115129c3.pdf?index=trueIn PDF document text
    • http://xafamikipu.epizy.com/c._h._u._d.__1984.pdfIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_c0e65cd131e1413589dd634261b6979e.pdf?index=trueIn PDF document text
    • https://7292b199-6d7c-4e84-b646-7854114497ba.filesusr.com/ugd/53361e_52f41262382e4703b6cbdc574dd10684.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/bizapogolavaro.pdfIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_783881a51e8b4388bf691f59065ce852.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/89331146257.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/auslogics_disk_defrag_for_windows_7.pdfIn PDF document text
    • http://xomikinexeb.epizy.com/93299828391.pdfIn PDF document text
    • http://gifidabula.atwebpages.com/23699265877.pdfIn PDF document text
    • http://zasegusof.epizy.com/44626198803.pdfIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_b634d19491ff4b7e9ea6448d53f391d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitozi/executive_summary_engineering_report_template.pdfIn PDF document text
    • http://fililexex.rf.gd/airtrain_jfk_map.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11284 4820 bytes
SHA-256: 30251598e31e8aca9791e68005dcda1fe4a83658ead88c5690fb8bd4dda4aee8
font_01_sfnt_off000122dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DD 10420 bytes
SHA-256: 76ec5367b05af8c60df77d3ebc697cebdc953e12d38562e4832bd81b4c7c9349
font_02_sfnt_off00014673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14673 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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