Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfeb7e18130f6ec2…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 02:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9600fb5185a49a0d315ef377a57eaedf SHA-1: 71b4e1e2a7e13a0c3f2074969f6935fb2d88a27d SHA-256: dfeb7e18130f6ec21c3b668f2c8313caa2f4d638efb6d9b53ef11ed2dec87d40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The document body is unreadable, but the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate attempt to obscure the malicious intent through a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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.
  • 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://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/23772527219.pdf In PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139b58fcfc3c---kubulukakuregezup.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/joluvopumakewevurito.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/nufamubipat.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/37592746248.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/safog.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/xuligopipigemeritajawuje.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/86821418013.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/josulewejewiwina.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/86072788603.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/78351496567.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/zowatewidewarozaxitog.pdfIn PDF document text
    • http://thevalleytrader.com/files/12373531001.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/biletosupiv.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/puwajagewifixapasuxiga.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1631236563/file/46537262060.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/sotiwuxavivi.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/22145163166.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613274981498d---10848524412.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-5/20210905163548635052.pdfIn PDF document text
    • https://dyaa.club/uploads/file/41782704136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cat+house+ideas+minecraftPDF 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_off0000dbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 16828 bytes
SHA-256: 4ecad80e42c9e7450cd3bfaed732bbd3d4930904b74c42c81993935e4bc8f5b3
font_02_sfnt_off00011fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD3 10824 bytes
SHA-256: 1a4a09b78625aa89badd66e057b982a1aca51ba6dd1ef8713880c9675413e140

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