Malicious PDF — malware analysis report

Static analysis result for SHA-256 03dc103f72f8c983…

MALICIOUS

PDF

68.7 KB Created: 2021-09-29 06:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9814afc22b724e5b794dbded28122664 SHA-1: 4240239fb0c4becb4a1b08af904779c8fb0a481a SHA-256: 03dc103f72f8c983adf02dc65ffb51718be2c75bf99bc8ed957ed68c187a085b
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it's a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of numerous external URIs, many pointing to PDF files on various domains, suggests a phishing or SEO abuse campaign. The primary attack pattern involves directing users to a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ylpcl.com/ckfinder/userfiles/files/32689557996.pdf In PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/67654824980.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210908_DA9D99A08054B226.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/27459477441.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/47574315403.pdfIn PDF document text
    • https://skl68n15g-n2ox.com/contents/files/33329373973.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/86993224378.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/wurigodi.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/gukofepu.pdfIn PDF document text
    • http://sowaprojekt.pl/files/file/xavewo.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/6944124777.pdfIn PDF document text
    • https://maisonforville.be/documents/file/zafolikapubuvuvi.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/22923742348.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/numifikupenorut.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/6148264439.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/62859912742.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/misabamarodek.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/tjsfbei2pcc0v3bddrbjhvqv5u/92480779406.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/94901064320.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/konodigibu.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/11550286305.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/rebal.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/41274090107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=droid+for+windowsPDF 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_off0000adfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC610 16444 bytes
SHA-256: b642e17d7f726660850c4647749abedeee3423baec4f840a49cfdbe1291e1591
font_02_sfnt_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 9996 bytes
SHA-256: cc2953921a4916f976f5b222b27eb4cbf11218d7e828059518aa81f7e59d3b82

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