Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5da98e165b02753…

MALICIOUS

PDF

68.6 KB Created: 2021-09-16 21:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1353757a314dddd5f30f6e9aeaa245e7 SHA-1: 5a87ae5b9a34e51921f5ad047f93a84dc9a81a8a SHA-256: b5da98e165b02753d5ce5ab3c0bf3667c47c93a65550c8947bcaf0043977f0a9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a clickable action and hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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 0 text block(s), carries a click-outward action, and is only 68 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.
  • 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://philabc.ru/uplcv?utm_term=swam+double+reeds PDF link annotation
    • https://bawauang.com/contents/files/85324001036.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/6876159499.pdfIn PDF document text
    • https://susta.vn/userfiles/file/59523805780.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/1904409699.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/vivofawezivubepexudajeti.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/dixafowute.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/31909557207.pdfIn PDF document text
    • http://abwessex.com/uploads/files/63894902538.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/97412983717.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/45374658995.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/8389300196.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/36979868985.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/98266183819.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b8f3681b83f86b3186bdcd91fab86eb8/vuriveguxogolurexobifa.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/jowatatif.pdfIn PDF document text
    • https://birotex.rs/images/files/masirijetifaluv.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/wodukazoxabudefelo.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/jchesr6qe3g0u6um09dg0m9nnc/74823423778.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/92374889181.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/71682466877.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/16625596238.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/46255429522.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/sabatavizofogezev.pdfIn PDF document text
    • https://foulardfotografando.it/file/62619892375.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_off0000b147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB147 10516 bytes
SHA-256: 280f36bad1b2e734c358398e8868dc9d462239385b889d72e31eda83d954fdb3
font_01_sfnt_off0000c944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE156 13876 bytes
SHA-256: 790784eed4ec75a8a8565375e39e073feb35b96eed3eefa794da06b71554116a