Malicious PDF — malware analysis report

Static analysis result for SHA-256 34507f76f0cdd590…

MALICIOUS

PDF

71.2 KB Created: 2021-03-14 01:15:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 2b55a6b560aa660d3ab516acbd7f9b9d SHA-1: ce15994c1d1080e79269f1e50f87372f807a3d5c SHA-256: 34507f76f0cdd590ba0db8a7053c7cd0c06ebe5ae195030f5cebc48505346561
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to 'aptitude test questions'. The presence of numerous external URIs indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/award?keyword=aptitude+test+questions+and+answers+with+solutions+pdf+in+tamil PDF link annotation
    • https://cdn.sqhk.co/rivotoxupow/jdezhbv/crossword_puzzle_maker.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/JjfjgYc/tofapav.pdfIn PDF document text
    • https://riligasiguvenu.weebly.com/uploads/1/3/5/3/135392009/1764067.pdfIn PDF document text
    • https://bebamewikirebu.weebly.com/uploads/1/3/0/8/130874540/6099314.pdfIn PDF document text
    • http://wipababotuzuke.iblogger.org/zevomure.pdfIn PDF document text
    • https://torudedo.weebly.com/uploads/1/3/4/3/134352944/5756118.pdfIn PDF document text
    • http://tikenifoziv.22web.org/2016_buick_verano_service_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/rosavuzezig/jchfHgg/40276571184.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/3nKrDn0/code_html_player_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/zinumazak/hkHNrhc/29088603250.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/atjavvo/lamelerisexopexajuve.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/bcD6R14/jumpstart_mtg_arena.pdfIn PDF document text
    • https://debimagobu.weebly.com/uploads/1/3/1/6/131637583/wasutasade-worerazasa-lalawutavapixu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wasalesex.epizy.com/see_s_candy_application.pdfIn PDF document text
    • http://buxazub.epizy.com/16406809988.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/88470768799.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/ccna_200-_125_study_guide.pdfIn PDF document text
    • http://lagarudu.epizy.com/biwirenegukevizotegofar.pdfIn PDF document text
    • http://zilenidebu.epizy.com/gevosenekelewuku.pdfIn PDF document text
    • http://difofeb.epizy.com/lamukak.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/dexulefopexalamanurad.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_off0000d587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD587 5488 bytes
SHA-256: 09d764d30951b092074d3644f0a3c2465deffdff426f63cf8b7bf2928175c8b9
font_01_sfnt_off0000e81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81C 11848 bytes
SHA-256: 45e8775e1b44bfeea62c5aa90ea1f87e6e1d17c89a2ce0f751a1de681d0fe946

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