Malicious PDF — malware analysis report

Static analysis result for SHA-256 a637d1c5db764166…

MALICIOUS

PDF

86.1 KB Created: 2021-09-19 22:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 843c6683ab20d00bffeb080bd1562ef3 SHA-1: 139ef46e09803a9688f3c77edaa734d1bd877fe8 SHA-256: a637d1c5db76416616d23f2d06e9cdc13419bdf8fd6e8ff9a41681ab15c0a785
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. It contains numerous embedded URLs pointing to a link farm, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern of hosting many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/26286991852.pdf In PDF document text
    • http://craftland.de/res/wysiwyg/file/rafitomeje.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b8a9a7c96---vutaguga.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/98186225310.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/tikutadenu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/7dohibdjcltte4poi9ld6pvjvo/pevofuvutawat.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/36521355985.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/68342977670.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/6392662304.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/80086862946.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/60502562768.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/xanosudadup.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/26975543279.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/sugumuwiberivik.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/fegovepopefajokunudovoz.pdfIn PDF document text
    • https://agros.net/uploads/file/tetivurerevurulan.pdfIn PDF document text
    • http://lobi.md/userfiles/file/mojajonumiperojami.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/69153965271.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/16531254575.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/64624512833.pdfIn PDF document text
    • http://santabruna.cl/upload/file/zazenexowanobigaw.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6144C7F4239FA.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/62617963296.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/83387458724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+app+subscriptionPDF 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_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 10548 bytes
SHA-256: 999f429fe53291249522deb41d067040de800de383efe022022fc6bdf22a198c
font_01_sfnt_off0001066f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E81 17180 bytes
SHA-256: e5fe773691cfe156c5a7eaa0e4883b14af535ad1dd9918d9bcd2e857b06bae67

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