Malicious PDF — malware analysis report

Static analysis result for SHA-256 507bea58aae05c8e…

MALICIOUS

PDF

86.2 KB Created: 2021-03-25 15:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d0489e09b43f5a13d6d31997d09f99c6 SHA-1: 1d193fd1acb39ce7c8a0cfdb424ba7b75d4bea42 SHA-256: 507bea58aae05c8ecda2964370903acfd70ef6f2daba9cdf8c32aa4e94d1e997
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple external URIs, with a high concentration on disposable hosting, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text related to linearization of a function, likely a lure to disguise the malicious intent of directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=que+es+la+linealizacion+de+una+funcion PDF link annotation
    • https://cdn.sqhk.co/zujumatatub/izgjI3W/katumumusapagomazimisapi.pdfIn PDF document text
    • http://nopuvobetag.mygamesonline.org/milajepajitovunezup.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/iiK9gfL/26674505730.pdfIn PDF document text
    • https://vexinafofonazes.weebly.com/uploads/1/3/1/8/131871992/b5153aff9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393625/normal_603e9fc4d38bf.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/2jc0get/defender_110_for_sale_texas.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/can_you_buy_a_pitney_bowes_postage_meter.pdfIn PDF document text
    • https://danisamotaroz.weebly.com/uploads/1/3/1/6/131606121/reravarefemeki.pdfIn PDF document text
    • https://cdn.sqhk.co/pesenexur/uJbidhh/free_kick_goals_messi_vs_ronaldo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404503/normal_5fd0461e71f9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_601aef4bca130.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/eSTCEgj/satoji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://desakoda.rf.gd/kabevuworewopekovu.pdfIn PDF document text
    • http://subutolibi.rf.gd/jujegob.pdfIn PDF document text
    • http://fepapemifen.epizy.com/wejosupixawejagilolati.pdfIn PDF document text
    • http://zajupulavofawi.myartsonline.com/adobe_creator_mod_apk.pdfIn PDF document text
    • http://ruzakema.onlinewebshop.net/how_to_make_alkaline_water_at_home.pdfIn PDF document text
    • http://dimizisunope.epizy.com/end_of_year_report_examples_ks1.pdfIn PDF document text
    • http://kivarutumo.myartsonline.com/differential_calculus_textbook.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_off0000f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 5028 bytes
SHA-256: 1a56943fa06ed26bf48c368359722e5e72f57c6e19757cba366a2fb95c10a544
font_01_sfnt_off00010adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADF 12932 bytes
SHA-256: 6195a52fa7695aed759e740696a01706d919369107f68a0c64f09a89a0c57de7
font_02_sfnt_off00013516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13516 16060 bytes
SHA-256: 713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74

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