Malicious PDF — malware analysis report

Static analysis result for SHA-256 53303f966869a07d…

MALICIOUS

PDF

81.1 KB Created: 2021-06-11 09:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c8e291e4a6c08bc70761b26e4d69a992 SHA-1: 55b507891869ee9d81d72cd371bd3bf92caf99c2 SHA-256: 53303f966869a07d2b5f40929e127657f68d8ebcfe491b4e842476209230f198
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable hosting services, which is indicative of a link farm or phishing lure. The presence of a specific search term ('pokemon x and y ppsspp download') in one of the URLs suggests a targeted lure. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

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
  • 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://crewmak.ru/pbw?utm_term=pokemon+x+and+y+ppsspp+download PDF link annotation
    • https://luwigemo.weebly.com/uploads/1/3/4/5/134597726/534045.pdfIn PDF document text
    • https://pidilamobojuri.weebly.com/uploads/1/3/5/3/135310388/4621343.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453103/normal_5fefb2af75c89.pdfIn PDF document text
    • https://tanavizone.weebly.com/uploads/1/3/4/7/134709943/7726053.pdfIn PDF document text
    • https://xakabitugaret.weebly.com/uploads/1/3/4/3/134366923/1483263.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4467593/normal_60b2223f18e80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_605c769f6d190.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481155/normal_5fc608abc1b10.pdfIn PDF document text
    • https://guxiwuwo.weebly.com/uploads/1/3/1/0/131070036/2a4f3a8ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144575529/how_to_write_a_letter_of_receiving_money.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/w/file/fetch/144414954/nibopoletupojudola.pdfIn PDF document text
    • http://redejok.pbworks.com/f/totufifovolijutoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d353e4b1-cf8c-4e84-8932-e236ef9f6677/42674414332.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/w/file/fetch/144515568/wowumofudukonegakowev.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/w/file/fetch/144510783/is_shadow_and_bone_a_good_book_series.pdfIn PDF document text
    • http://zotugon.pbworks.com/w/file/fetch/145119801/72806089116.pdfIn PDF document text
    • http://guronavageba.pbworks.com/w/file/fetch/144497988/funo_trigonomtrica_exercicios_resolvidos_pdf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7684dbf1-b478-43d6-b7b6-ee33f0f87fcd/893130331.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
    • 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_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 5336 bytes
SHA-256: 85686a02774f2f1cbf1faae3335483f59c7eef798ef48eb3f026e05d4fc99c0a
font_01_sfnt_off0000fa7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 11364 bytes
SHA-256: 8b353a37497e546f64c23671ae94cce4d2d894a4a312194bdf9be9ad772bdb8d
font_02_sfnt_off00012149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12149 16332 bytes
SHA-256: 8f51b056a6a54690a445d2e8d545d75e15a341a9790d2cac60fd40960d9a83ea

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