Malicious PDF — malware analysis report

Static analysis result for SHA-256 61bb8e9117eaefbf…

MALICIOUS

PDF

83.9 KB Created: 2021-09-21 05:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c69fcf64c1feb6e7417f5d89d7f59fab SHA-1: 63a7eaff67b701f7963fe3ff0f8880bfc374a937 SHA-256: 61bb8e9117eaefbf774c1211c4ae6897b9c636189059eeda02abb549f87341cc
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The high ML and ClamAV scores confirm its malicious nature, likely serving as a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://uptownchantilly.com/uploads/files/63065071462.pdf In PDF document text
    • http://fu-xin.tw/uploads/files/202109102238342672.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109110116132129.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/72952648891.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/kataweme.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/51404511708.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/fe1cbc68421a5e481ebf801a0cf8e346/40585919244.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/32865312800.pdfIn PDF document text
    • http://fxmeat.com/upload/file/270f357fdb4c17ace6394ba3e744bed4.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/zoxakenoluvovunomukup.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/ledegafakakekij.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/9297985164.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/gikima.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d901ec896e---36736295901.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/gukubew.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/sofomasove.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/zofosebumapudiwixete.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-14/20210914071036367229.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/79714876691.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/kikizagonebedopelonoto.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/kisavenururiranaze.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/lezimuj.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/kewokeki.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/33867735702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gyroscope+apk+downloadPDF 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_off0000e1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BB 10648 bytes
SHA-256: 108f1fe336a3fa853700492299a771c3f94b9fda36813c1e7cdeef546cf24501
font_01_sfnt_off0000fa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 18552 bytes
SHA-256: bf524f0f6f2ad0d6d88476fe4bdbdf465a9419ba8f3c7e6b2a55af7fee98589c
font_02_sfnt_off00012a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1