Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfadeb1b8e33da5…

MALICIOUS

PDF

79.0 KB Created: 2021-03-15 10:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dee2412bb0009ebad91ff7249714bb14 SHA-1: 591eeb7d34a7b4c501091131756fd25ba634ed65 SHA-256: 7cfadeb1b8e33da50f2cf288b09526153f1f4bfc452e0c920ba4a1afaca2e304
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://zajinet.ru/strik?utm_term=which+harry+potter+characters+are+cancers PDF link annotation
    • http://carbackseat.site/mares_puck_pro_o_cressi_leonardoiahcg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480579/normal_5fc8d4def0ee6.pdfIn PDF document text
    • http://siankaanmexico.com/scientific_research_grant_proposal_templatersaje.pdfIn PDF document text
    • https://bugedosase.weebly.com/uploads/1/3/2/7/132712019/7875634.pdfIn PDF document text
    • http://securespot.ru/xojijutemodosalidab5abt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410207/normal_5fc842da1377b.pdfIn PDF document text
    • https://volasetabis.weebly.com/uploads/1/3/4/8/134879514/fosope.pdfIn PDF document text
    • http://bu-markett.com/learn_bookbindingwrrng.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/behringer_1202_specs.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/81924851404.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jagux/92867796874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c983cd7-025f-4cd2-8cf4-c8d141a5008c/gender_as_a_social_construct_ctet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/221909fe-b80f-41e4-9029-0663421fde8d/2012_mercury_9.9_4_stroke_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2af6851f-e2f1-4856-b8d7-f82d0c017e7b/68940965174.pdfIn PDF document text
    • http://koxolavomuzo.myartsonline.com/powoba.pdfIn PDF document text
    • http://witesenigo.atwebpages.com/syma_x8g_camera_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/684aa611-9ab5-45d5-b25a-f82c07328087/fleck_5600sxt_installation_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/2092284948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d74baacf-fe31-4cb9-94b9-cc5060a1e549/1001_dark_nights_the_prince.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_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 5104 bytes
SHA-256: 7879864cfea01ad39ed78744e602a9d55facf1377d1596953cea5afab815eab6
font_01_sfnt_off00010918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10918 10996 bytes
SHA-256: abbd98f0c855b54414929c73cb7e85f377a1e9fe1468cba86c932b55f6e0b02a

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