Malicious PDF — malware analysis report

Static analysis result for SHA-256 b037f0be436ce44b…

MALICIOUS

PDF

99.2 KB Created: 2021-10-11 01:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3faf9d419414bfaa24f9464def81534b SHA-1: dbdd57eb5cc69c137bc0737bed8b85f7c585e4d1 SHA-256: b037f0be436ce44be1c6de51ba58ca4bb7a1295f288dc86a99b391827fa33c1e
166 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of algorithmically generated URLs and link farm characteristics strongly suggests an attempt to lure users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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.
  • 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://tjjjsh.com/uploads/files/bamigoxevese.pdf In PDF document text
    • http://www.hangmandigital.com/files/file/liduxisewenu.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/78304925862.pdfIn PDF document text
    • http://adriennemason.com/assets/files/80564659912.pdfIn PDF document text
    • https://wittnebel.dk/file/44102031810.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/fesapefipujazajotu.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/41612758929.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/48199964171.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/mebikuk.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/bonajikefarobomeravuke.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/96742991016.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/25820836971.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/mutuvorelop.pdfIn PDF document text
    • http://kalikraft.com/images/file/60669610962.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/romemexelazurevuw.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/29274942129.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/towozijewe.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/dodofivaje.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/jenorafuxazaroga.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/lfcf8ccd59fob34elhn935log5/3647104359.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/14c96c3dac8002df83b6324ed3ea6d06/vododopetonobulapo.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/72376316045.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/zolezatetipeki.pdfIn PDF document text
    • http://bwc.lt/i/76933755323.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/nezusule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=who+does+macbeth+kill+at+the+start+of+the+playPDF 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_off00011677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 11120 bytes
SHA-256: 1a6d8af5a114e3c6419e672d83772e7e42320780de24e856a57b83f7ad9698d1
font_01_sfnt_off0001303e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303E 20816 bytes
SHA-256: 79f5f2f3462d842b57a1e07945c917ba9211c702a6c5ea7f15782f75ecf1b532
font_02_sfnt_off000166a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1