Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28ef4c9bce30928…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 13:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6fb37bdd116252a7ba96c725b7b9ad06 SHA-1: 4692ff984f682093298a7f5a730caf1ddcbb2223 SHA-256: f28ef4c9bce3092845ed9548c36e8d4ef1b7bc9fdd4e69663b38a97d70d554d8
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used for phishing or to deliver a second-stage payload. The presence of embedded JavaScript points to its use in exploiting vulnerabilities or executing malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 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://queure.ru/uplcv?utm_term=the+great+indian+kitchen+full+movie PDF link annotation
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399b22a6bb9---28091712288.pdfIn PDF document text
    • http://land89.com/ckupload/files/43492138671.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/kipapa.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/gemodejolowijo.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/bedajelugodisidatixuxe.pdfIn PDF document text
    • http://splogservice.ru/content/files/58161495214.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/93815192022.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/57452767202.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/gofadenesowekujag.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/94393830804.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/raxem.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210917013131.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/seloxalokoluson.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/50846728098.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/timufuj.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/xibep.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/xupaketixixonaxafepekujid.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/42135402016.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/bd267fda51351adf6ecf90aeb8a82642/57872374460.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/48151654073.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/58588718515.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/tumatav.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/darozodibiras.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://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_off0000dab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 18040 bytes
SHA-256: aa7bb674552cf51e2389162929a2ac2e45698bdd8a8b6f199623c980de3b0648
font_01_sfnt_off000108b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 10976 bytes
SHA-256: bd722fc88a766f15eb2d46a2d01e2385d3f488c263eb9f8e137210eed1bb532f