Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b23242816ff75dc…

MALICIOUS

PDF

73.4 KB Created: 2021-03-20 18:15:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c099f5bc56be14e47fce2269ee55756d SHA-1: 384110d4f20ec85cc38c0b76535be536e1ae10b1 SHA-256: 3b23242816ff75dc109ad8d2a1264acab24a0cc307fa2d43a2e0e26251a5a6aa
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://lozipotod.ru/strik?utm_term=how+to+use+a+handy+stitch+handheld+sewing+machine PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496592/normal_5fda5e5b4786a.pdfIn PDF document text
    • https://bategasef.weebly.com/uploads/1/3/2/7/132712490/kadexevigejusa.pdfIn PDF document text
    • http://gegebafebofad.scienceontheweb.net/oxford_bookworms_library_stage_6_cry_freedom.pdfIn PDF document text
    • http://leadtop.co/rcbs_reloading_dies1ww45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473651/normal_6019259ccfae4.pdfIn PDF document text
    • https://rimekadosa.weebly.com/uploads/1/3/4/4/134467829/8081180.pdfIn PDF document text
    • http://xakerof.22web.org/sheet_metal_gauge_sizes.pdfIn PDF document text
    • https://wevinavuligi.weebly.com/uploads/1/3/4/5/134505150/e473ae190.pdfIn PDF document text
    • http://2220202.ru/james_allen_white_texasv7h8i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463538/normal_602026312703e.pdfIn PDF document text
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/kovenu-sedujopuvatedu.pdfIn PDF document text
    • https://sufevibuxaka.weebly.com/uploads/1/3/2/7/132712301/xojepuw_zotezajud.pdfIn PDF document text
    • https://talosemes.weebly.com/uploads/1/3/4/4/134494853/jexinefuzoranak.pdfIn PDF document text
    • http://myfavoritesun.xyz/what_is_inclusion_policy_childcare8x4c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rixibedi.onlinewebshop.net/toro_22_recycler_lawn_mower_oil_type.pdfIn PDF document text
    • http://zunimesigo.rf.gd/sifasalesijuxekirarukar.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_off0000e27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27D 5412 bytes
SHA-256: 083a0b0cf97dad288f3883deebec0d811e880647c806360c5bc8719cecae2a1f
font_01_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 10556 bytes
SHA-256: 34c255cbd7de13c882e869663ebce0dc2eb113978d4561eedd2b0d9336f27afd

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