Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9b2b8dcc94df06…

MALICIOUS

PDF

77.0 KB Created: 2021-02-25 06:48:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: bade98e658c8320f5a0328b01adad39e SHA-1: eecb8717bf69cdde6048633f7e7c7cdfdc6161ff SHA-256: 7d9b2b8dcc94df06a237d3d0757769c55cdf367746b0041aa02e6fb93d777a21
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious sites. The document body, though heavily obfuscated, contains references to URLs, suggesting an attempt to redirect the user to external content. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware distribution lure.

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://baarspo.ru/strik?utm_term=sig+sauer+p226+vs+legion PDF link annotation
    • https://gilepijojuju.weebly.com/uploads/1/3/2/7/132740412/nudati_bobavipujozo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385206/normal_5fc9818070f94.pdfIn PDF document text
    • https://kiniwotonupit.weebly.com/uploads/1/3/0/7/130776343/zivetiponizaje.pdfIn PDF document text
    • https://cdn.sqhk.co/wemopizajazo/2jbCRji/57055815384.pdfIn PDF document text
    • http://rutefozur.22web.org/facebook_bot_developer_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408172/normal_6035454b8f4ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375716/normal_5fe16dc53d23e.pdfIn PDF document text
    • https://sakenudawajaka.weebly.com/uploads/1/3/4/5/134595508/5625414.pdfIn PDF document text
    • https://wobufijurix.weebly.com/uploads/1/3/1/6/131607063/zuwepolutomofu_zebefejuv.pdfIn PDF document text
    • http://kepibarufot.22web.org/54901065557.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/tripura_rahasya_hindi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jimugen.epizy.com/hansel_and_gretel_cast_2020.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/how_long_to_read_the_handmaids_tale.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/merit_badge_university_2020_missouri.pdfIn PDF document text
    • http://lobakixadob.epizy.com/canada_immigration_application.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/yowhatsapp_version_8.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/how_to_replace_panasonic_microwave_bulb.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/jilagoforamejelekerarugor.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/nanuxupiraw.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/autodock_4_manual.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_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 5436 bytes
SHA-256: 7b0ea5597fa15c484248ee710de53dc363dd0e5653883c505f637a8780bb8be6
font_01_sfnt_off00010431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 10080 bytes
SHA-256: 986e998acfccd1a2e3cdefe5870217f03be27a4fb02fbef9714dad03dc3e4653

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