Malicious PDF — malware analysis report

Static analysis result for SHA-256 482eb6019ed1b0c2…

MALICIOUS

PDF

70.4 KB Created: 2021-09-19 03:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b5da0d412c8d05d942c6f288d2fc861b SHA-1: f0d4f2371b8b141e0686fea6d91011967d9384bd SHA-256: 482eb6019ed1b0c2a3706cccfda1cd7205942957c3d0a1cc2a4db20211417e82
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links pointing to various domains, many of which appear to be disposable or low-reputation hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

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 https://crysiq.ru/uplcv?utm_term=pac+xon+friv PDF link annotation
    • https://oreopay57.com/ckfinder/userfiles/files/lamunorikidegarukumipaxi.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/toxugojonenixi.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/95643089318.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210919061417.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/nolegoposixajomod.pdfIn PDF document text
    • https://pellevah.com/upload/files/34044984193.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/47461d555448d9b61b61057b8b35e2d5/bipuxemupug.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/66165325065.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/34194030577.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/puwikisegalodavaxukevugo.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///pegafijodovuzari.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/dunez.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/kasujeramejupexixaliran.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/63120979667.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/53039253903.pdfIn PDF document text
    • https://0900107678.com/upload/file/joderipu.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/80664137980.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/96464071557.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/95621220513.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/redobalopum.pdfIn PDF document text
    • http://nprofit.hk/userfiles/64804788164.pdfIn PDF document text
    • http://rs-entp.com/upload/file/nerixopuvikanuserobapudar.pdfIn PDF document text
    • http://koala-al.com/d/files/tixajawoguf.pdfIn PDF document text
    • 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_off0000b4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFB 10056 bytes
SHA-256: a760e03363f4d4e4d248ae235b2300e40fdd0eafb14e5ac5fb1dd74c558ad5ee
font_02_sfnt_off0000e37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 16176 bytes
SHA-256: af62eef3026790560ec3637608f282c286ff60ef0a934da0efacf77295c7ed88

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