Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e740ab4812e574…

MALICIOUS

PDF

76.7 KB Created: 2021-09-14 15:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f1bd4d2fb37b245a958578ffb486183d SHA-1: 07b5f0885e8e9355e89d902885ff3c99b92d8be1 SHA-256: c0e740ab4812e57457f3f382bc896c0f00af053ae4dc23cb745cb9f9585385af
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external URLs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially being used to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://pistant.ru/uplcv?utm_term=roblox+apk+mod+2021 PDF link annotation
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/numasabe.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/54303761717.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/fokurezuxiwezevewupezi.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/34318713063.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/4229541187.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/48125807742.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/89617342408.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/gomit.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/zokok.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/93147279212.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/xawowowerupugawititi.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/kejik.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/60913418453.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/93054420152.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/65876676430.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/lezanolamamikevudimop.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/76655351903.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/tawepalanuzidudixigi.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/wovemifutetaxavabasab.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/19635545723.pdfIn PDF document text
    • http://newmob.it/userfiles/files/10971322708.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/28875731270.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/pefifowiratisapewowekoju.pdfIn PDF document text
    • 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_off0000c787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC787 10532 bytes
SHA-256: b23ba343cda3f3c1297c84f45bf6f60944e4d18fde0184073d519113b51d7924
font_01_sfnt_off0000df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 17692 bytes
SHA-256: 007e2b19d3e10fe18a3c198bfc665d578dc323d37a1fdfe2e19ea2b1f6b1d5fe
font_02_sfnt_off00010cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1