Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c72c411ae438c3…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 23:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 470d6a8a953829271bd998679007d56e SHA-1: c343557d5553b8768d55a3fee828e2c7da971522 SHA-256: 16c72c411ae438c38fcd5e06b16aea6144847dc07a6297103ceccfa4183d75e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://giayviettri.com/img-ftec/files/43106477608.pdf In PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/bizimadosopolufavudutu.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/vuzirasixasopokuxusoxaneb.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/35022883282.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/rosegatikexalo.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/93378498189.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402bfa86e48---36012134826.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/74767143902.pdfIn PDF document text
    • http://xn--299a941ap1h.com/userfiles/file/20210923042120.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/mugekukes.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/gizefigev.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/44848433424.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/0904a3abcd1ab32b628c5bb146f82071/91841703037.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/nagar.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/komedatisexa.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109171552579753.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/49424642485.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/mewutigosovuzegaraj.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/sapitofadomamafudumax.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/jopebilifatipe.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/putaro.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/lajalarutawu.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/58954505275.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/zazafidu.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/goduliwidexux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ads+on+my+home+screenPDF 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_off0000b31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2F 16612 bytes
SHA-256: b7f4dbd271945237b18ba43ef8d280757d422b402fbf010222d52fc97d7e4a84
font_02_sfnt_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 10332 bytes
SHA-256: ea0472c6703f8e9536636809ba9eef7b72727b2b76225fd9e1ee54a394dee86d