Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b81da236a363c2f…

MALICIOUS

PDF

67.7 KB Created: 2021-09-22 11:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d4c9b2692bea2d138fb8665dc1aa19e0 SHA-1: 61d571036b21168df3b172be20888108ea6aeb4f SHA-256: 9b81da236a363c2fcb1cb9c7ebcff367a215f90a7160cc6b922e369b4586a920
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, being image-heavy with a single text block and a click-outward action. Heuristics indicate it functions as a link farm on disposable hosting, directing users to various PDF files. While no scripts were explicitly extracted, the ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the redirection of users to malicious sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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 67 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 http://lafenicealcamo.it/userfiles/files/gapazubex.pdf In PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/vizibuzad.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/kobupiwiv.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/27242896851.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///sewugalo.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/pajasusukap.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/82801869820.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/rodokuwemiriwujawalak.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021922310153637.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/44613509491.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/30636992737.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631589579_ce265fe047.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/texaxaromizi.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/gabowutafudewogikiw.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146807abbc43---votuvozabeboginexeg.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/xiwalumarer.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/v55fkm3rv7g50te8ff7aqbprl3/vusakibodibixasukileki.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/xivudomuzelobogog.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/59297020847.pdfIn PDF document text
    • http://ecole.ru/text/images/file/40280782003.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109110032214978.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/ziterosogugezorojejumupe.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/zugamoviwuviju.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/kiwafejikupivalaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=prime+for+android+tv+apkPDF link annotation
    • http://forum-auto.ru/data/files/bubiko.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_off0000afa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B7 13792 bytes
SHA-256: 75d8ccacb78df721a195a768daf8f00e6a5a9e83f679d50dc8a516868536c240
font_02_sfnt_off0000e951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE951 10604 bytes
SHA-256: 2c5e092c2f3cc8727b4443236b7108d7f045e7063c17d75ea128afb04faaa39c