Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d05268c0caf98c0…

MALICIOUS

PDF

78.5 KB Created: 2021-09-10 02:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 92a32cd77bdefc513c31b5996ffe7a13 SHA-1: 8ff81c853cc5a1500213c2b3ebaf5358e4f0e68a SHA-256: 8d05268c0caf98c07691a8d920fb8f7699fe7a9c4ef5412bf7939fbd29fce536
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba6a9527a---foliwigujedirimefaz.pdf PDF link annotation
    • https://stotex.rs/files/daxaponijoleneferas.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/80264144633.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/davesiwewuketevomejujoje.pdfIn PDF document text
    • http://biomehl.com/images/content/files/49148078323.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/xibumaxivegaka.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/f4fc024qkor099jipri29pkohq/suzivizelosuwulamov.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/musisimefipesukobaj.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/89483985333.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/zodejugesorebovololugo.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109080425288532.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/sopamode.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210907_034523.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/98825847125.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/mutavetusotovap.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/69460359376.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/71245972969.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/4565877607.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/64313775729.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/lagipozebetevivewig.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/09/46784887415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=10th+std+social+science+textbookPDF 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_off0000c5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CE 21484 bytes
SHA-256: f18fa018df09cb041f962471b334a60549bc365c4fe5b38532b9f261db256ce5
font_01_sfnt_off0000fc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 10780 bytes
SHA-256: a11b853065918d0eb0f72df8a1167a902e8b5787ea4d5d37c97833da6ef8c601
font_02_sfnt_off000114d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1