Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39ade20fae157b5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 04:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2064b697d991fc670f8a87983807aa03 SHA-1: 9b49c8194fd8bd98a52128d0c5523dfe6ea4455a SHA-256: c39ade20fae157b58df74bec235527c5ba2bae6e0215249bc5f6996dabe46af3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The presence of numerous unknown URLs suggests an attempt to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://etevent.itweald.com/uploads/files/613d1216e5085.pdf In PDF document text
    • http://baoveantam.org/upload/files/93057692587.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/11127426676.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/5382198243.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb723f133---47686233574.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/xoniv.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/vijesamijoxikilikuzat.pdfIn PDF document text
    • https://eclearusa.com/images/file/7261542059.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-7/20210907090157123997.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/duziwegi.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/tezedijumezujusa.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/lomisajojolik.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/nitiritomebaz.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/19105693992.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/51208786374.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/25989252161.pdfIn PDF document text
    • http://www.siposferenc.hu/html/kujuv.pdfIn PDF document text
    • http://retailcop.ca/files/22397607462.pdfIn PDF document text
    • https://norservis.com/files/files/sutewezekaxavekusaden.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/zupej.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321507cbd7c---60732425673.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///92984359175.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/28404081232.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/85508912790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+train+your+dragon+homecoming+online+watchPDF 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_off0000d7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BA 18204 bytes
SHA-256: 104c88a751352e0a9bc92d60aa93a462c6859cf781dc92934720dc2ca31a0a07
font_01_sfnt_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 10940 bytes
SHA-256: 7c00fa2f59e6a40e65d65fe5b2b77b4e7fa6e1550b4828b1ac670dd5b0b1a680
font_02_sfnt_off00011fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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