Malicious PDF — malware analysis report

Static analysis result for SHA-256 660a72b7f6310c05…

MALICIOUS

PDF

76.7 KB Created: 2021-04-12 00:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 22433e045912dca32b19fa6a3f8c4e2d SHA-1: 5c26afcb0bdd11f3fc07feaca4e2a35a05811f31 SHA-256: 660a72b7f6310c05fe502377dacea34dee6f1481f9938e78ae6b7c3de3f440a2
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 0.9996

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://bologen.ru/strik?utm_term=the+princess+bride+book+age+rating PDF link annotation
    • https://rimivitelur.weebly.com/uploads/1/3/0/7/130739194/6ccb2ab99c76e03.pdfIn PDF document text
    • https://norabemomo.weebly.com/uploads/1/3/0/9/130969424/6126356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_600dab295a39f.pdfIn PDF document text
    • http://brumbum6.xyz/gurerutaritobuvektcaw.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/what_do_you_eat_on_the_hcg_diet_plan_phase_126h0p.pdfIn PDF document text
    • http://loxesitigogu.iblogger.org/kigasok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402936/normal_6018eccd76827.pdfIn PDF document text
    • https://lutavazakagege.weebly.com/uploads/1/3/1/3/131398084/rekawidedojalu_muluzo_jipabugekar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393209/normal_60017734729cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423752/normal_60654bd1a2170.pdfIn PDF document text
    • https://tenekitu.weebly.com/uploads/1/3/4/0/134018212/1402103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417138/normal_602c4f135622d.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/vosenufasoteb_sodagexizix_guxora.pdfIn PDF document text
    • http://tovarzone.ru/22754741875d6ecc.pdfIn PDF document text
    • https://fozonened.weebly.com/uploads/1/3/5/3/135326763/varilu-tewip.pdfIn PDF document text
    • https://nekazexupogufeg.weebly.com/uploads/1/3/1/4/131454238/48e7f55e1a.pdfIn PDF document text
    • http://instapodarok365.site/cant_help_falling_in_love_uke_chords_elvis945vj.pdfIn PDF document text
    • http://net-klientov.ru/vexunakvkmhw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuverojipu.rf.gd/33570633687.pdfIn PDF document text
    • http://fugusun.epizy.com/dumaxulotefubak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a262065-5b8f-4ebc-a74a-78e224d4f3bb/xixakirejuninarel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e401a969-2b64-47ec-bc3e-9eed4b0bc5f5/58252917077.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_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 5456 bytes
SHA-256: 66456eadc7ef0e7d9ffedc546370dd7b916b41328d46cd267ccc8ee158423a82
font_01_sfnt_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 10372 bytes
SHA-256: 9ba65e358c709877fdf5214b26b6c28efbfa2fdb127db46345691d839b253876

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