Malicious PDF — malware analysis report

Static analysis result for SHA-256 d515db2d4ff2dc4f…

MALICIOUS

PDF

74.9 KB Created: 2021-05-02 21:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: da3e07e525dbcecb1d34c6e524651faa SHA-1: 54f4096dc9b56d8c731f47b7f4750c136eb8d293 SHA-256: d515db2d4ff2dc4fc88aa7574bfd416067e194ae8bbabe2981a08b24b1b63d34
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-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://soxebez.ru/strik?utm_term=jitterbug+phone+setup+problems PDF link annotation
    • http://rufoferapavinew.medianewsonline.com/xexukojebeg.pdfIn PDF document text
    • https://jomitapekox.weebly.com/uploads/1/3/4/3/134319499/linakora-nubafef-gaxefad-xefulu.pdfIn PDF document text
    • https://gefobivuvevu.weebly.com/uploads/1/3/1/3/131380717/juxeda.pdfIn PDF document text
    • https://liwarelavoz.weebly.com/uploads/1/3/5/3/135398493/lijene.pdfIn PDF document text
    • https://sevenunoxesu.weebly.com/uploads/1/3/4/3/134341304/xifisotowipitawoto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425924/normal_5fccdf24eaf92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474475/normal_606a51e47027d.pdfIn PDF document text
    • https://sudarixadozitot.weebly.com/uploads/1/3/5/3/135331315/4d5ded07d414720.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413563/normal_6066e945dd199.pdfIn PDF document text
    • http://dizofuses.mypressonline.com/gimaledotavawi.pdfIn PDF document text
    • http://lubevos.scienceontheweb.net/effective_academic_writing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422658/normal_5fff979780d4b.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/mazodinuzomolonikemu.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/ts_16949_vs_iatf_16949.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://titeviwexesu.rf.gd/how_to_thread_a_older_sewing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/list_of_all_command_prompt_commands_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/burn_iso_to_usb_free.pdfIn PDF document text
    • http://vogafaxusa.epizy.com/nazokezusetigemojonesot.pdfIn PDF document text
    • http://luxetejafolakem.rf.gd/fapoguperozarebapo.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_off0000e603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 5152 bytes
SHA-256: faf3fb2715073449d79097368c44368d5a9a81bf7fe834e230464e68a65fcbdf
font_01_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 11048 bytes
SHA-256: 16d10734d6ea80baa77d6b5a4065333dd1a297323d8d25dd576ad4541840fb3a

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