Malicious PDF — malware analysis report

Static analysis result for SHA-256 e06125352edc9097…

MALICIOUS

PDF

71.7 KB Created: 2021-09-22 10:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f08679ebc4a3d351f2fa48bd61a1a80 SHA-1: 4cac12f8446c315df84ffcd4f79f41fa177b1e0b SHA-256: e06125352edc9097a27aa161fafaa9a7c648d8a55bc64871534b4ce7643170b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613358110af59---zavobuwil.pdf In PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/17938434472.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/sedelivigutosaxigo.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/62249076716.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/20692514972.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/xuwufufijowis.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/74731632319.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/24663529611.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/18410128187.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/goziworukafuje.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/zorot.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/siziluvegupazejoxifinub.pdfIn PDF document text
    • http://etre-belle.su/images/file/31280610578.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/11549667871.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/51323481420.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109161122239487.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/nepolebuvuvudabibixevo.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/xalafokolokufixabajinine.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/39447143276.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/vexoxipexajilujodep.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/9409940004.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210920015934.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613994aad692c---nasugevobetapedide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=install+windows+programs+on+chromebookPDF 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_off0000b71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2F 15632 bytes
SHA-256: 72c65a1c3748681c0bea055f4428fb878cd1a1b59905a44ee29dabcc99df36d3
font_02_sfnt_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 11228 bytes
SHA-256: 63ce4f267aa0feef768b4b875309adcacb3a73b15ff81284ac396ee257850ef0