Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2b61288be864e9…

MALICIOUS

PDF

73.5 KB Created: 2021-09-25 10:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6716334d3ef74a0e0103eaefcf601ae5 SHA-1: bc76c3c5aaaa0e751f0185428425d1b69956d14f SHA-256: 9f2b61288be864e9c3fdecd57afe1ea8fdfef5e9923d293bcc5862697d04ae4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

Heuristics 5

  • 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.
  • 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://catamma.ru/uplcv?utm_term=mobile+legend+bang+bang+app PDF link annotation
    • https://fedico.ca/upload/editor/file/25595204369.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/74839554405.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/kamiwab.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/97992807322.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/bogajujumiwirezafivemag.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/51613326698.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/renet.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/82584621774.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/wuladamejepepekisudanap.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/42045722728.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021092505492570554.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091210312073499.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/49061662016.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/newejebibebirupidusozej.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/rojojenir.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/femerodas.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/24332579838.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/85916939824.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210920_869CF6FAB1A0C414.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/ditovebiwesozog.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/tilozeg.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/sugafelugalupiwi.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/18406104403.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/moverebukufejipamirebur.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/67676713347.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/15145276098.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/24718357310.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99E 3648 bytes
SHA-256: 952ff1c8b0727fd569928da3e13f9988ad2521c31e9bb7a0319d6e92874d91dc
font_02_sfnt_off0000d7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F4 15416 bytes
SHA-256: e2d87aee8be33af19f821f41cc5f9d40a8962b3fb1cb2d5d9fdbedf5a962cb52
font_03_sfnt_off0000ff35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF35 10332 bytes
SHA-256: 167e6fb16c833002876ae3595f66150e376a6cdda8f1771ed916b5dcb416364b