Malicious PDF — malware analysis report

Static analysis result for SHA-256 2665280c4cf7f73a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 19:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 898b7abf7de5863209366c7a2371e8c8 SHA-1: 44e1bcf00ae18e2484619f7ae8f2af01685b5979 SHA-256: 2665280c4cf7f73aeec921fe63b2189fb19e32059817668419a947880d63f656
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various PDF files hosted on different domains, indicative of a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts suggest a malicious intent to distribute content or phish users. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://fs-select.com/images/blog/file/61159779352.pdf In PDF document text
    • http://pphu-joanna.pl/fckpliki/file/xalogegojigopa.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/jinukinoxi.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144840a0e451---97003027818.pdfIn PDF document text
    • http://tfforming.ru/d/files/losuwixafilunodovegofepu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/5c8301dadca079ccd9921b179ca86b09/rivinijax.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/27220144344.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/rezanalut.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/fabetelewijobozoxivogemid.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210910144344.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/wojovedavopoki.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210904070441243.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/66650907442.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/9673250440.pdfIn PDF document text
    • http://livestocktool.com/d/files/18261559008.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/54991313556.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/68055776403.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210902195224.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/73644289015.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/59258734528.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210905022445.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/36826511432.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/19145317832.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/82728508126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=nba2k20+mobile+apk+modPDF 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_off0000d757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD757 10532 bytes
SHA-256: 62c4027dc573e1201f79650a8e0d696864862a1d4e763c978851c3e83a3b5ee5
font_01_sfnt_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 17476 bytes
SHA-256: ff7720e75dc1d3506b73ddfe6edc49cfee823a073c600e2babe6077dbce1e0a1
font_02_sfnt_off00011bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1