Malicious PDF — malware analysis report

Static analysis result for SHA-256 d718ee7de8f801a1…

MALICIOUS

PDF

80.2 KB Created: 2021-10-16 23:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f51611bd6b66d3b6b97002a4416934e9 SHA-1: 2edf957758eae07840061fa7033dcc77b812511f SHA-256: d718ee7de8f801a1c0bfa2e60115a5ea3df502f3417cde18833a3953e56e375f
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing attempt. One specific URL, http://campbellelectronics.com/uploads/pugamuzesadabu.pdf, is flagged as a link farm on disposable hosting, indicating a likely lure to a malicious resource. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://campbellelectronics.com/uploads/pugamuzesadabu.pdf In PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/57729729731.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/9513744188.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021100511365163.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/40291981324.pdfIn PDF document text
    • http://fialki.su/godasesosibazuko.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/75707462315.pdfIn PDF document text
    • http://thevalleytrader.com/files/53805289230.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/kepido.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/jopinusapawurum.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/xagix.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/ruwixiwabe.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/37613112049.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/41491132417.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16163741c7b5cc---bobopogo.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109240027393760.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/jovaxof.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/gonakomir.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/67450225819.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/gupitamawaxoxevigakerepa.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/nalazilibadi.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7fa4cf693cc82e67b1313ea3e6a1bc06/32745255410.pdfIn PDF document text
    • http://yibetter.com/data/files/33772352067.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/ruvaselufibadufo.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/tumarituxewokoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/KGDyd8lM0uI/uplcv?utm_term=tabachnick+and+fidell+2007+pdfPDF 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_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 17880 bytes
SHA-256: 9af903e0b869e976d80a62bcf8fad3db14cb798ba89d46688ad601ee78ce5e6a
font_01_sfnt_off0001028b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 10720 bytes
SHA-256: fa533fc7008039141998ee602ce5e85213c4ba9d9a4187bbea1a6ee13d7208cc
font_02_sfnt_off00011aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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