Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a77bd16f4d4166…

MALICIOUS

PDF

77.8 KB Created: 2021-03-16 17:54:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 47ae4c601e702e92f0948e3d4964aa16 SHA-1: 28f489adf50ba76c714f3fe7ea1ae45ff8d9b7e9 SHA-256: 09a77bd16f4d41662abeb91710d6abf5d0ea3708b1dfd82e174f08f329995c2f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm designed to drive traffic or host malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'Is disney world closed until january 2021', likely to attract clicks to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=is+disney+world+closed+until+january+2021 PDF link annotation
    • https://cdn.sqhk.co/jarixizotib/d5shxZx/5289442778.pdfIn PDF document text
    • https://kowokilu.weebly.com/uploads/1/3/0/7/130740572/5486214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_5fe956d8d2ebb.pdfIn PDF document text
    • https://feziriwavejoli.weebly.com/uploads/1/3/4/0/134096108/6298779.pdfIn PDF document text
    • https://gopikuximodel.weebly.com/uploads/1/3/1/3/131384340/zatof-komafitomije-pisiruj-revetizip.pdfIn PDF document text
    • https://latibexuwer.weebly.com/uploads/1/3/0/7/130776356/xigixekawob.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/bjhifuk/water_bottle_flips_challenge_extreme.pdfIn PDF document text
    • https://mipapipav.weebly.com/uploads/1/3/4/0/134012398/nokiwutakagodofatise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455670/normal_5fd95e448ac07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470399/normal_5fc748aadc1f9.pdfIn PDF document text
    • https://bajiwiga.weebly.com/uploads/1/3/1/3/131379875/8a7e940a4ca28.pdfIn PDF document text
    • https://genunilime.weebly.com/uploads/1/3/4/3/134344847/lirudivizimisenugipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448100/normal_604cc36cf3b96.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/nupetumi_nuwemefelorin.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/b367e931-ee8f-42c6-9cdf-d057cbac68db/gleim_aviation_weather_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/807ecd08-42e8-484b-89bd-52a49bb91edb/dark_souls_3_design_works_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00e8ecf-7682-4a49-a2f5-c87932337443/79958489348.pdfIn PDF document text
    • http://lulojoduvos.epizy.com/jijamemibabiwof.pdfIn PDF document text
    • http://zitegarapopufis.rf.gd/72497731695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/147f03ea-29a8-4752-9bff-258bd0788144/black_boyfriend_jeans_fashion_nova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10287b28-f931-49bf-9126-c31513c7ed24/kuved.pdfIn PDF document text
    • http://nusavigosewu.epizy.com/photoshop_tutorials_adobe.pdfIn PDF document text
    • http://taguminuligifis.rf.gd/sales_agreement_template.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_off0000ef52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 5468 bytes
SHA-256: 7caeeb9d477a30ba50b3ed6d688174c3af63f4269c07f95237b1e757e33beb28
font_01_sfnt_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 11524 bytes
SHA-256: 065cb09fbca5247c2085b4703be795a6172da052cf0800368e781ff1d7218483