Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa35d903ae33eca…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 20:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 445f028aee1a8ffe3f95dc34bca4253a SHA-1: 0c2f7a549017a753ce5729c3d45ebf96db9d5d6b SHA-256: aaa35d903ae33eca8dbac61ce4ef9239a73a3a9bcec1fdc26c9e29838e81d817
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://beveragesgs.com/userfiles/file/69047046879.pdf In PDF document text
    • http://career-id.org/ckfinder/userfiles/files/99368282676.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109120924314514.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/83220346371.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/nofelakezuwa.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/dagibegal.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/9607223817.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/52675195227.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/11390837268.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/fererali.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/pezusorokizubuzoru.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/vunon.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/64857096051.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/juvipigita.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630803023_1.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/82951820815.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/ronuvulerurali.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/66709710743.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/69591008aa132c4e0280a73b00795efb/92984388357.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/38157126010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=drawing+app+androidPDF 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_off0000dc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 10212 bytes
SHA-256: 40195a0d4376a90333472ceb280029dd17c35f210e48d43d8b0322808c85ac48
font_01_sfnt_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 17304 bytes
SHA-256: a0d57cc31e3a9aa7d5e9f19f25e5adcee0470da376c4d08b8f16b53200301a6b
font_02_sfnt_off00011fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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