Malicious PDF — malware analysis report

Static analysis result for SHA-256 6813965f5d90624d…

MALICIOUS

PDF

88.7 KB Created: 2021-02-28 07:07:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b732e93cc7b5cc1b6c5c755486193f84 SHA-1: 3810a854274080092ab185265222555e99d42662 SHA-256: 6813965f5d90624df87c42d288c8cb7ff27e59b09d14758619fa21cb04e53d17
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically phishing. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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://xezojetit.ru/strik?utm_term=samsung+galaxy+note+20+ultra+release+date+us PDF link annotation
    • https://cdn.sqhk.co/zogobadakedu/aja4ge8/xekabipogoratoke.pdfIn PDF document text
    • http://faxixovojaja.sportsontheweb.net/sapafufinimemovete.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/674088231474aqqx.pdfIn PDF document text
    • https://cdn.sqhk.co/rotelizedo/giaR5ib/joe_pesci_okay_okay_gif.pdfIn PDF document text
    • https://sagisumofag.weebly.com/uploads/1/3/4/8/134882066/9781225.pdfIn PDF document text
    • https://papukelub.weebly.com/uploads/1/3/4/6/134666119/givofa.pdfIn PDF document text
    • http://mebovedu.getenjoyment.net/is_learning_python_useful_for_finance.pdfIn PDF document text
    • http://exemplpusj.com/osu_medals_guides8ifr.pdfIn PDF document text
    • https://cdn.sqhk.co/jijasitov/ejejfhc/23017341271.pdfIn PDF document text
    • https://cdn.sqhk.co/zanewijepex/bjbif3j/nakolanatupojumarelosa.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/idjhDJW/honda_pressure_washer_pump_rebuild_kit.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/zowikasus.pdfIn PDF document text
    • https://cdn.sqhk.co/gupuwiwi/QZigQMz/gapowaxi.pdfIn PDF document text
    • http://fusekimutoxi.sportsontheweb.net/76317492841.pdfIn PDF document text
    • http://afracheat8.xyz/nature_of_national_interesty34bn.pdfIn PDF document text
    • http://pokupka.space/epson_powerlite_home_cinema_730hd_lamp9wt5b.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/jdjdrSR/77550617435.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/hjaidSJ/40248957507.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/belopudevuzuza/garoluwip.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/12517026978.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/estudo_de_caso_sobre_anemia_falciforme.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/44023009908.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_off00011ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 5692 bytes
SHA-256: 780f65815279ee92799d47c62925b3d1232e8d13af189ea43c4e9261712734e4
font_01_sfnt_off00012e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E17 11424 bytes
SHA-256: 676da38999af172b9884947cbb0faff576fa8fa3fd57a0da76529254fbec548d

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