Malicious PDF — malware analysis report

Static analysis result for SHA-256 5158c5233672a6d8…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 18:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 58d4935a0ef74f38ab10b57391550c78 SHA-1: 3d5b7439d18ddad703a859984126529dcab04a12 SHA-256: 5158c5233672a6d8d0f0b49ea800ebaf82ad45bb96649fdf85bf8806cbc2276c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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://phutungvespaco.com/luutru/files/3243079129.pdf In PDF document text
    • http://5m-tti.com/uploads/image/files/ziwokev.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/pazuduruviwatix.pdfIn PDF document text
    • https://aleemanschools.org/userfiles/file/77233109055.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/8179835825.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210913142214330.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/mokomuxapozobuwolum.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/vizupodaduzasajujoxeki.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/97042275616.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/gujuwaleguwurapoxopam.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021971225423779.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/kunesozime.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/950286736.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/bidojalit.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/lenevidatilinafupoxote.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/suzavowajemi.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/murogivetupowakupewivojax.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/2560249524.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/sususetiwurid.pdfIn PDF document text
    • http://belean.pl/userfiles/file/55121881146.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/najiluluzaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=market+leader+intermediate+3rd+edition+answer+key+pdfPDF 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_off0000d645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 17240 bytes
SHA-256: 81bd1607685b19e74bf36bdf89c9523394612f9c975c9cb5b713784db856994d
font_02_sfnt_off00011af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF2 11116 bytes
SHA-256: eb9d6e6330f086836ebdc4f2dd6cb3b1a5e9fb028615effed754a1f56a1e9c15