Malicious PDF — malware analysis report

Static analysis result for SHA-256 9518da4d33eec40f…

MALICIOUS

PDF

77.1 KB Created: 2021-09-19 06:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb0462566325df09808b0c20cdbe5b8d SHA-1: f060b6fe26ec2ec30718fda8e4ce5f227841f6e8 SHA-256: 9518da4d33eec40fd0d86cf3422965ba340a92ae6926c5a6edfd85e4f0cede49
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document may be designed to trick users into calling a fraudulent support number, consistent with callback phishing or tech-support scams. The presence of external URIs and a link farm structure strongly suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://queure.ru/uplcv?utm_term=patel+ki+punjabi+shaadi+full+movie+download+720p PDF link annotation
    • https://zohopinler.com/calisma2/files/uploads/24773372462.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/30334888539.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/lalopafowapo.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/1738532031.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/51337814559.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/8ql9jsn02d1qljur4jl2f5kbis/10083900202.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/vadodigetuxa.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/jinidefuvuluj.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/bozitepaza.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210902_C84110E515F5D190.pdfIn PDF document text
    • https://costarica4d.com/contents/files/rezujovizotudej.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mevovemipatok.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/71587138813.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/desepapilabakov.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/52254100708.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/83049490005.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/zatobof.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/54153889636.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/2273509839.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/93975207095.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/lupinovizapofogugobiwumab.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/derukekudabapolit.pdfIn PDF document text
    • https://plasy.com/uploads/file/joganifu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee0e7932a1---fufotavokufujazexuxu.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/27232547185.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_off0000c556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD68 18000 bytes
SHA-256: eeb3597fdb30105b6c5dba13e604fc906c2a742b761603f99fd14f8f871f484c
font_02_sfnt_off00010b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7E 11568 bytes
SHA-256: 1919ea37f98db8de72814ab8fbe2952830e768cf3669b3b7b000348b08502ffa