Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f1621b8ae6e49a…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 03:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a32d7f4ae7182a3ed95365a0ab7a97de SHA-1: 5d80505632fcf1d1245ebeb4ce2888b3def0d67e SHA-256: 80f1621b8ae6e49aca0e95df4b54476221f710ff964c39bc692afc5c5fbd4431
114 Risk Score

Malware Insights

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

This PDF document is identified as malicious due to embedded JavaScript and a callback phishing lure. The document's structure and heuristics suggest it is designed to trick users into calling a provided phone number, likely for a scam related to billing or refunds. The presence of embedded JavaScript indicates potential for further malicious actions, such as exploiting vulnerabilities or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.privathospitaletkollund.com/ckfinder/userfiles/files/377722810.pdf In PDF document text
    • http://velo.hu/UserFiles/file/sosipaxafukupofakufisepi.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/81324855417.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210908021746.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/gazumabugokiselabisitanow.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/35626462282.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161341a0c46ec0---jalovubinonogubuzotamali.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8ea0308f73df1699134a10c8ab488e6/57984961104.pdfIn PDF document text
    • https://communitytreasures-co.ravebusiness.com/gbe/useruploads/blogs/files/laniselukomiz.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/70188088989.pdfIn PDF document text
    • http://phm.vn/upload/files/kebimofokokefulikefuwaneg.pdfIn PDF document text
    • http://kalikraft.com/images/file/93164584824.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/76912637890.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/98608580811.pdfIn PDF document text
    • https://ckmandarin.com/uploads/8738862266.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/35135057353.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/41430187393.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/78339533574.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/pajiviwapowatofole.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/mamalixofe.pdfIn PDF document text
    • http://gnox.vn/upload/files/69136556616.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/fakopilemij.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/xefiwamogexuxof.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/60847099948.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/vusegarepejomovuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=la+princesa+prometida+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CD 14368 bytes
SHA-256: 4310562011f40b9de8c54a35e274690933edb5dce5baf454f7a579b8ba434bfb
font_01_sfnt_off0000d65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 10692 bytes
SHA-256: 8140aaa507831ece84b275a732e5c2a5cb4f90a460e8e956f6cb09c00d2776a5

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