Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77ee9441ed653f3…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 04:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d58687f5100cd8cd3d63dfa5d1945844 SHA-1: e24f4481856c637b8bcb0db7c4bfecf12a8b00c9 SHA-256: e77ee9441ed653f3c3f9205e2dbb7ad806f55c8631622419dca7076f1809a3a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to unknown domains, suggesting it's part of a link farm or phishing campaign. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the execution of malicious actions, such as downloading further payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://consultemergingmarkets.cubsindia.com/files/41712125642.pdf In PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1c86f3a55---10971334653.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/fopovefofopamunaxax.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/54244925827.pdfIn PDF document text
    • https://breedlife.com/upload/files/mubuwubowelejiwixilero.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/pibenisonijorudafowode.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/34815351842.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/2585884932.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/89880153671.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/38890988307.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/99850382542.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/38744333021.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/61343094864.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/wupajopixu.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/58132102132.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/60682091040.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/momapopuwuterikugema.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/fazusidawojago.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/93318262849.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/vawenujiwogutulupedevege.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/dijup.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/19769842943.pdfIn PDF document text
    • http://mlead.net/images/e/file/noxapolomag.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/ridesodulafab.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/biromatifajawelirif.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/80972603946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=where+is+android+marketPDF 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_off0000dc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 10552 bytes
SHA-256: 5e70a87e260745ed3a5bb068d9c5541cadb10d023e1e072a3921bf13eb9bfe9a
font_01_sfnt_off0000f45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 17512 bytes
SHA-256: bb820f7b1f015f23a335f426d48ccfe524413b3c77efe4aa3b48904aa996b503