Malicious PDF — malware analysis report

Static analysis result for SHA-256 19bcd28df1572d85…

MALICIOUS

PDF

69.2 KB Created: 2021-09-24 18:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5212a259ee3b391eeb7ab9915754d6c9 SHA-1: 91f145d4573789297d59f4207efa001384555156 SHA-256: 19bcd28df1572d8587bbf7584eb8d263ad97596b322d73d3b4ed8e297af57181
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing lure by heuristics, indicating it's designed to trick users. The document's structure and size are typical of a screenshot-based phishing attack, aiming to obscure clickable links. The presence of numerous external URIs, many pointing to potentially malicious or unknown domains, further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 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.
  • 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://xn--atpta-nfb.lv/images/userfiles/files/pirexisa.pdf In PDF document text
    • http://mindatpeace.us/uploads/files/mibisuwipifop.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/19878441319.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/kugogavusegawuj.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sidibasup.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/sokojowu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394dc33d6dd---15693616436.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/89467423752.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-24/20210924172951749564.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/48582719423.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/4823723403.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/dawuvonijuzudif.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/tilovofewonetiximikup.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/gupazigido.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/niwunugomo.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/zesamigagakeji.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/78252804232.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ab5f37512---wejif.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/12040838554.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/rofaba.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/3769553488.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/9635238841.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/lenepekesawazob.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/sevenomazisuzefijek.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/57729739045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=wobbly+life+free+download+for+windows+7PDF 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_off0000b080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC892 14516 bytes
SHA-256: 6905634ec2fac0875f15b61c492b4afe0a2ff943b73393d1dc032b2bcd4ae173
font_02_sfnt_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 10632 bytes
SHA-256: 7fae05c260604f0b83ba797e3a7e79134c5f3217c89cf5e4c742be2d4ef24cd6