Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda1305774accedb…

MALICIOUS

PDF

75.4 KB Created: 2021-03-19 05:49:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 572ec7891d08f5d2c76ec3891578df62 SHA-1: a5f5a9757e36b860fc12396c43080827707fb0c8 SHA-256: cda1305774accedb8d1dcf4a63cec038f7b36ed489cc7e82c2d35e2e2754ae66
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on low-reputation hosting. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=chain+rule+calculus+worksheet+pdf PDF link annotation
    • http://reabook.online/arms_reach_ideal_co_sleeper_sheets58o1z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497093/normal_603d29169a286.pdfIn PDF document text
    • https://xizenarinirogav.weebly.com/uploads/1/3/1/4/131437147/2a3ec2beb8.pdfIn PDF document text
    • https://maladekokox.weebly.com/uploads/1/3/4/7/134745457/lutufezas.pdfIn PDF document text
    • https://feliwisinawo.weebly.com/uploads/1/3/1/8/131856919/ac56fa27edb.pdfIn PDF document text
    • http://about-central.com/zujafuzuzidifo562ce.pdfIn PDF document text
    • http://olx-delivery.cc/78316190814ejg54.pdfIn PDF document text
    • http://apparentlyopt.com/how_to_use_a_royal_epoch_typewritermr16v.pdfIn PDF document text
    • https://midodelawipage.weebly.com/uploads/1/3/4/5/134585137/8525675.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450259/normal_5ff39bcb3f842.pdfIn PDF document text
    • http://qupieasy.online/23136853276slqxo.pdfIn PDF document text
    • http://jobware.pro/how_do_you_set_a_woods_outdoor_timerg3zjq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465688/normal_5fe4136202f01.pdfIn PDF document text
    • http://olymp-trade.top/what_is_the_solution_of_inhomogeneous_vector_potential_wave_equatione8yax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377102/normal_5fca37efe6acb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480414/normal_5ff7f23e46908.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/31563831757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a81730-bfbe-458b-bcff-5d642d90b0f3/bulajudorulof.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/39756299540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e25ca9fe-f1ee-45e6-9ed5-2547cb57c4b5/zojirushi_bb-cec20_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/loan_agreement_template_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab73fbe-34f2-416a-a1aa-8970e572c2e7/city_of_heavenly_fire_hardcover.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/munegemilazeka.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_off0000eab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB4 5304 bytes
SHA-256: 2c0abc5fbd27a3582f06ae00b98d28b52d502165b6d98982466b1729e5316188
font_01_sfnt_off0000fcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCA 10340 bytes
SHA-256: 6b38b7c3b4afbb918abafa373cb050a2aaf59a0b4fed24f341c6452141fa51ac

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