Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ba090b0bf07216…

MALICIOUS

PDF

75.3 KB Created: 2021-04-08 00:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1dccd7c596790b8cebb4f8c1a21fceef SHA-1: 9c7cd111600dd2f0157c8946261403e08b6f6010 SHA-256: b2ba090b0bf07216fa932ef379487f219b561b9bf8c60ec3b83e5f534b9164cb
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 0.9999

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://kuzutuzo.ru/wix?keyword=factoring+special+cases+worksheet+doc PDF link annotation
    • http://mybestchan.online/why_is_my_directv_box_blinking_orangehw1p3.pdfIn PDF document text
    • https://mejibafizafev.weebly.com/uploads/1/3/4/0/134042836/7805917.pdfIn PDF document text
    • https://kirenokasanav.weebly.com/uploads/1/3/4/4/134445236/rifobinap.pdfIn PDF document text
    • https://wiwasowabomas.weebly.com/uploads/1/3/4/8/134858473/begaporonefig-rawog-wuxonomip-zumiluk.pdfIn PDF document text
    • http://vir-tus.com/do_you_capitalize_job_titles_in_essayseth3i.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/n56jbhc/guwajivosis.pdfIn PDF document text
    • https://cdn.sqhk.co/tobamozusaj/QgjhKgj/jurassic_world_ios_cheat.pdfIn PDF document text
    • https://bezijenogekise.weebly.com/uploads/1/3/4/8/134875893/3981625.pdfIn PDF document text
    • https://cdn.sqhk.co/semoxumid/otjiO2m/wubopego.pdfIn PDF document text
    • https://cdn.sqhk.co/mifopanikil/jdSHGgi/download_traffic_rider_mod_apk_terbaru_2020.pdfIn PDF document text
    • http://1cats.space/catalogo_mary_kay_marzo_abril_201810g5a.pdfIn PDF document text
    • http://job-finder.space/wumesapatuwugewojokofajeg5xyy.pdfIn PDF document text
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/nujudawivep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3543051b-902f-48ad-a748-9ae4ef4d96b4/the_vampire_diaries_merch_etsy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3414f2a-a433-4e86-ad54-3f10af1259a4/raxazel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/185aa363-7b51-43e9-a196-f3659c6a55b7/juwejikojibut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ab33b30-229d-4184-9d5d-7329d87a6f0d/what_is_included_in_ministers_housing_allowance.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_off0000e681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE681 5444 bytes
SHA-256: 9de1d8c4351ec1a46166eedef9a5d65b5f9ad7356cffe0d755df4918b47f0f5a
font_01_sfnt_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 10956 bytes
SHA-256: b2c37df668fbc0438eab7425b506a7c887576dab608a0330130c09a9ada03460

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