Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d04d607f6455d4b…

MALICIOUS

PDF

68.4 KB Created: 2021-01-11 12:29:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ca0cc26493079f789cf8aff39e1df920 SHA-1: b611e2b741317db0c8bddb5262debb6debad82ae SHA-256: 3d04d607f6455d4b9ec14258103ec7422766f5ccb35098b116d0da3a6141449f
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The embedded URLs and the ML classifier output strongly suggest a phishing or redirection attempt. While no scripts were explicitly extracted, the nature of the PDF and its embedded links point towards an attempt to lure the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/aws?utm_term=alcoholismo+segun+oms+pdf In PDF document text
    • https://cdn.sqhk.co/pibegufuxova/jMgvjb4/40031166261.pdfIn PDF document text
    • https://site-1178668.mozfiles.com/files/1178668/paralyzed_nf_ukulele_chords.pdfIn PDF document text
    • https://danuxuzajuzawo.weebly.com/uploads/1/3/4/7/134768569/sinusuja.pdfIn PDF document text
    • https://site-1166068.mozfiles.com/files/1166068/patwari_syllabus_rajasthan_2020.pdfIn PDF document text
    • https://site-1176339.mozfiles.com/files/1176339/idle_armies_cheat_codes_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366359/normal_5f878aa3e1689.pdfIn PDF document text
    • https://site-1172743.mozfiles.com/files/1172743/17185587846.pdfIn PDF document text
    • https://site-1174993.mozfiles.com/files/1174993/photo_editor_for_pc_free_download_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/JtIibig/fifizobarejevaf.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/jfYgges/tic_tac_toe_free_printable.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/38349856611.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/63951014234.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEF 5252 bytes
SHA-256: 505ab6b660fb1262be870fcc3ad2cee4373b7225c8685ecd3ffafd06e36c44a7
font_01_sfnt_off0000deb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB2 11064 bytes
SHA-256: ac3f164cdf036aa60c3078608c434dd73d501ccca06633375910a3ad685bbab2

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