Malicious PDF — malware analysis report

Static analysis result for SHA-256 543d1789c45dbe1e…

MALICIOUS

PDF

75.6 KB Created: 2021-03-13 14:56:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 294024421a8ca06f99b4eb286ef52922 SHA-1: ed566f256eee0d2958726397d0f6d658bb50a0d7 SHA-256: 543d1789c45dbe1ef52a8746d978cfa51b2ed31670797902b52798e2881fd4fa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. Heuristics indicate it's a non-clustered link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/award?keyword=personal+cash+flow+statement+template+pdf PDF link annotation
    • http://lenudes.com/grief_and_sorrow_piano_sheetmzbe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476007/normal_6009cbe2b62a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501029/normal_5fee704c80f5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_6014ac4522a73.pdfIn PDF document text
    • http://biomaniks.website/sennheiser_rs120_wireless_headphones_manual5hr3n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408462/normal_5fe852f155cc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490263/normal_5fdfdfcc4319e.pdfIn PDF document text
    • http://introdom.ru/jamman_stereo_looper_phrase_samplerjc83y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464523/normal_601742ed4d33e.pdfIn PDF document text
    • http://shopsmmv.site/minecraft_stoneblock_guidej6243.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445544/normal_60045f6d3849c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387411/normal_5fed01c34a518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485699/normal_60264ea09ee83.pdfIn PDF document text
    • https://cdn.sqhk.co/webaxepibi/hhjbHie/lucky_block_mod_1._16._3_curseforge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414691/normal_6006e77a3dab1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490754/normal_603f2d363e752.pdfIn PDF document text
    • http://uber-global.com/72241945261ji8x5.pdfIn PDF document text
    • http://googsnat.space/axa_company_pune_informationzbfws.pdfIn PDF document text
    • http://saleproducts.pro/gazaxuwexofuxanunoracq59y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445739/normal_5ff861829ad2b.pdfIn PDF document text
    • http://mattelipsticks.site/wozivagogixanakid8bhl1.pdfIn PDF document text
    • https://cdn.sqhk.co/fexiseme/Eigh2hf/zombie_apocalypse_games_for_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 5488 bytes
SHA-256: 5a61d545c8fa97c654fd300d7311bce9e4c51dc08c3c32bccc2c5b5b130ab4b8
font_01_sfnt_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 10652 bytes
SHA-256: 17ade79f911422a00ca6face85a22e812e9a6df018aa01e9ae688bd9cc9dd3bb

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