Malicious PDF — malware analysis report

Static analysis result for SHA-256 de56c5fc4d43ca79…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 01:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0adf597f6cca922248322b02a4309cb SHA-1: b541c87fc03b042633ca3b7a805e3d8b9538202b SHA-256: de56c5fc4d43ca793154a30274fdfbcf307bb09e581af4f5d48010a8257e054b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to suspicious domains, and a heuristic identified it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body was unreadable, but the presence of many external links suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 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.
  • 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://synerhu.ru/uplcv?utm_term=podcast+addict+sd+card PDF link annotation
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/85797328365.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/rorugelube.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/dolomifemoxateso.pdfIn PDF document text
    • https://badrivishal.com/media/lugetekumafigiwegedufoloj.pdfIn PDF document text
    • https://blokhol.com/upload/files/fosewosumebudagos.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/27204633989.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/berefiv.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ae609njhg86daclq5ge69dob53/33826742798.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///23078205706.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/kuzudak.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/sufig.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/koveruzetububexagaze.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/bijepebuzekadin.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/93465338817.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/vejuwoxar.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/sagiru.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/kodafa.pdfIn PDF document text
    • http://boldogelet.hu/media/zonomejitefup.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/mokup.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/11373413432.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/wawilobod.pdfIn PDF document text
    • https://red-adlay.com/upload/files/77976418738.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/lemaluvikudavaneduma.pdfIn PDF document text
    • https://polandpools.com/contents/files/vagus.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/77422148572.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/kekusoz.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/20409005941.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_off0000dabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABF 17520 bytes
SHA-256: f4cf53a95e784c64cef4efe298538967ba5f53647a027e6edb58ebf01834d1db
font_01_sfnt_off00010842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 10080 bytes
SHA-256: 3176a4f7703ac9210f3a3230ddfeddbefec3f1870d614c5d0ac52c8e913f592c
font_02_sfnt_off00011ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1