Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed0c9b3b98fd980…

MALICIOUS

PDF

75.4 KB Created: 2021-03-17 08:07:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 230b6cc272f295a2a426a573a10b2584 SHA-1: 9bf4894fcd6f97f6b63f0b4261937dc7cf939108 SHA-256: 3ed0c9b3b98fd980944651dcb19fe100e0f11130d25637fc2a45d6fb95092aef
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 0.9996

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://kuzutuzo.ru/award?keyword=archicad+17+tutorial+for+beginners+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393514/normal_600cef8fc2041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451231/normal_5fd298aecf81c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464525/normal_60098809c4ded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491969/normal_600c8d4296279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419206/normal_60413cd460ccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489846/normal_60492c5f2d5ea.pdfIn PDF document text
    • http://madalez.22web.org/well_being_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457854/normal_603914f183b9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422908/normal_60512c0d3bb12.pdfIn PDF document text
    • http://kozijadeji.22web.org/28622820903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368494/normal_60254f95a0536.pdfIn PDF document text
    • http://filozajerezabi.getenjoyment.net/nozasuroritikuv.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/92057033473.pdfIn PDF document text
    • http://xazirinid.iblogger.org/72986851996.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484126/normal_5fe0ca240f28c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418199/normal_60394b9eb6bcf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sejazoneloteg.epizy.com/50908193159.pdfIn PDF document text
    • http://dozuxix.myartsonline.com/inductive_and_deductive_grammar.pdfIn PDF document text
    • http://lugenizuridaj.atwebpages.com/swtor_synthweaving_crafting_guide.pdfIn PDF document text
    • http://wuwexufituvefug.rf.gd/how_to_charge_a_ifitness_watch_without_charger.pdfIn PDF document text
    • http://todifisafi.atwebpages.com/bulelimaraximar.pdfIn PDF document text
    • http://dedamedasobime.epizy.com/lubiwawarumukas.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_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 5676 bytes
SHA-256: 9ae59a6c3df513ac851973eedc60cc51fc7703fb8a5f40ae835b755d6175fef8
font_01_sfnt_off0000fcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF5 10296 bytes
SHA-256: 28cc4327b3a2ef0d08db3f19f854b11cb7b3197cf95b3ea6eb7d850d28a90f9f

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