Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7dba904f7715ad…

MALICIOUS

PDF

69.3 KB Created: 2021-02-20 14:00:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 51665720dbe0d2d296fa6b2daa0503c0 SHA-1: 1d5d234e0020d77215fea702901baa258389f2e5 SHA-256: 1d7dba904f7715ad285e273db7987b7a485373d2249d8c5fb5db8c691e3cbc22
154 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many hosted on disposable domains, and the high ML classifier score strongly indicate malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment, suggesting the embedded script likely facilitates phishing or downloads a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jottigo.ru/wix?keyword=curious+george+birthday+clipart PDF link annotation
    • http://fagemolorano.iblogger.org/93226262535.pdfIn PDF document text
    • https://cdn.sqhk.co/zodozane/hjVokoX/berenixutakiwezewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488807/normal_601fb6f206486.pdfIn PDF document text
    • http://fitokapss.xyz/69407907473cu5ua.pdfIn PDF document text
    • http://berkeciftci.net/taj_mahal_information_in_marathigrs6i.pdfIn PDF document text
    • http://kiguvogig.iblogger.org/gumonutakibo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415045/normal_5fef4f5be037b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446045/normal_5fe698cb2a0e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465123/normal_6025c3734baba.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/craftsman_style_house_exteriorbc71f.pdfIn PDF document text
    • http://uablog.website/pathfinder_kingmaker_pc_game_manualnmqsd.pdfIn PDF document text
    • http://idclick.cash/common_core_standards_ela_11th_gradeiw5ty.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/novipaliwid/gundam_seed_episode_guide.pdfIn PDF document text
    • http://businewon.rf.gd/88619196638.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/wuxofudepijefobevesor.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC520 5376 bytes
SHA-256: 050851640925d86b3f6b1718af193b17a8fbaf0c2855644b061d2bafefa3cee0
font_01_sfnt_off0000d780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD780 10148 bytes
SHA-256: 4a8d783b5e32e7625c5be175e418c40acb1f096a9b37a29ab432e8ef3af943a9
font_02_sfnt_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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