Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a9d8345165a8e5…

MALICIOUS

PDF

92.9 KB Created: 2021-06-06 10:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f30bfdbf5dc28a2b94645a975fa4c491 SHA-1: 8e85cd397f4d10dabf25450ea36546b10bce9471 SHA-256: 25a9d8345165a8e5b72b98a516b0f566bdf1329505b957fe6218351ab4271275
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, appears to be a lure related to fundraising event budgets, combined with generic urgency and download button lures. The ML classifier strongly indicates maliciousness, and the presence of numerous external URIs points towards a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/pbw?utm_term=how+to+create+a+budget+for+a+fundraising+event
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/tuladejoraxotevoxir.pdf
    • https://bobubimusibobu.weebly.com/uploads/1/3/4/7/134715312/be0c0e21.pdf
    • https://kugatovobubusub.weebly.com/uploads/1/3/4/6/134680339/rerugapesakupopug.pdf
    • https://sajulivos.weebly.com/uploads/1/3/1/1/131164476/tixetosexujada_vikibagazipitum.pdf
    • https://cdn-cms.f-static.net/uploads/4409992/normal_60163664962f4.pdf
    • https://cdn-cms.f-static.net/uploads/4408871/normal_604220ea36e8b.pdf
    • https://gofubemasuxa.weebly.com/uploads/1/3/2/7/132712405/kukalefekebis_getadilak.pdf
    • https://lotigasi.weebly.com/uploads/1/3/4/7/134705720/newuw-velawenesekavur-gudibozubarur.pdf
    • https://gupuletafajural.weebly.com/uploads/1/3/0/7/130776102/tisajaxumarofon-fugowudojofujud-rebadagesuke-nupesimojeduvu.pdf
    • https://static.s123-cdn-static-d.com/uploads/4472793/normal_60afe3112d70b.pdf
    • https://notebatamigoxaw.weebly.com/uploads/1/3/4/7/134715817/topuxobe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8c49f962-ed7f-4692-82a6-241a8e39a8b6/wewimugasaxogogepezow.pdf
    • http://zosajivapesi.pbworks.com/f/75415841556.pdf
    • http://ruwomodanom.pbworks.com/w/file/fetch/144461193/90939660347.pdf
    • http://kivupored.pbworks.com/w/file/fetch/144495492/wafeguvoni.pdf
    • https://uploads.strikinglycdn.com/files/aca27353-8f48-478a-9730-9e317efe2a64/33140094659.pdf
    • http://wepoline.pbworks.com/w/file/fetch/144696249/sevomidizizovulu.pdf
    • https://uploads.strikinglycdn.com/files/37db30d7-d065-4d1c-9614-9c816116338a/37907702227.pdf
    • http://luwivaj.pbworks.com/f/65441697662.pdf
    • https://uploads.strikinglycdn.com/files/acfebb60-9fdc-4daa-8720-8d3645223513/20874738216.pdf
    • https://uploads.strikinglycdn.com/files/5e1d48e7-3cae-485b-9f45-33a673eaf3a6/26728675377.pdf
    • http://gomedaj.pbworks.com/f/how_to_pass_the_ny_permit_test.pdf
    • http://dujimowiwup.pbworks.com/w/file/fetch/144694131/manuale_duso_frigorifero_whirlpool_sesto_senso.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012032.bin
29653966fe6967966eb675aa0d3900f76fbf13f06d6424f4bc7685b3ff6a8f73
pdf-font-stream PDF embedded font (sfnt) at offset 0x12032 5292 bytes
font_01_sfnt_off0001324c.bin
af9736d9f6510535dfd96a8e6252b3113d8dcc8392365b40cdf60af3602f1e6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1324C 11076 bytes
font_02_sfnt_off000157e3.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x157E3 4324 bytes