Malicious PDF — malware analysis report

Static analysis result for SHA-256 509e1744518b7c6a…

MALICIOUS

PDF

71.1 KB Created: 2021-02-22 06:58:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f9ebbd2eb2707821451b7bc2f5c14f6b SHA-1: 0dc6321ab9c6e8aba8922fe4810ff4afd2877a34 SHA-256: 509e1744518b7c6aa948377beec91e7529374bbc3f85a78697adf1a13d4ebe24
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the presence of external URIs suggests an attempt to redirect the user to malicious sites. While no scripts were explicitly extracted, the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=music+download+paradise+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472484/normal_601c626ed5f86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_602c70c909618.pdfIn PDF document text
    • http://rrrrkkkkk.space/namuxaxowulfihm9.pdfIn PDF document text
    • http://idealica-co.site/peak_scientific_nitrogen_generator_manualfjwgm.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/nostalgia_meaning_in_english_with_example7rf2f.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/pgihahd/cytus_songs_by_xi.pdfIn PDF document text
    • http://the-glow.ru/54164778745rimt6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385631/normal_5fcb34c96fe7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454421/normal_5feebc660eecf.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/wewiro/jiwolajij.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/favawasenogod.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/binisepozukinozurim.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_off0000d024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD024 5228 bytes
SHA-256: fde7ba6b28cca28ce1e1b841051aee87f56e43eaad5a7353bbd8c2027c4b85c0
font_01_sfnt_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 14448 bytes
SHA-256: 4d2e721bdb31af0bfc4d9c2e51eb15910f63672a027a7457a1bc03dc8664013f

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