Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c76d42bf6a383dd…

MALICIOUS

PDF

79.0 KB Created: 2021-05-14 15:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ef608e2c4193a2a8fbd17660e7dc6380 SHA-1: c6bc977104b1cb961989df760aa0a4d05fac7c83 SHA-256: 5c76d42bf6a383dd8fbdb720deb830c07c1477e09a79bde1cedf8bea0500a81d
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or redirection attempt. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains keywords that appear to be SEO spam, suggesting an attempt to disguise the malicious intent. No scripts were extracted, but the presence of malicious links strongly suggests the document's purpose is to lead the user to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=craftsman+scroll+saw+parts+ebay In PDF document text
    • http://rekugegik.scienceontheweb.net/cantonese_101.pdfIn PDF document text
    • http://vedevejunogi.iblogger.org/ac_dc_tnt_karaoke.pdfIn PDF document text
    • https://gojanaribebiw.weebly.com/uploads/1/3/1/4/131437307/nekaku.pdfIn PDF document text
    • https://fezuxikazosulav.weebly.com/uploads/1/3/1/3/131398093/tezerezesu.pdfIn PDF document text
    • https://dazuzezabemor.weebly.com/uploads/1/3/1/3/131380892/5349485.pdfIn PDF document text
    • https://nonejekorozu.weebly.com/uploads/1/3/4/1/134108542/be96905a.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/ziwujotapofonedajetofile.pdfIn PDF document text
    • https://golizagizaziw.weebly.com/uploads/1/3/4/7/134701046/dafajozup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/63bb8ad1-11d5-4d2f-baa9-3b4d62c9d523/14663526429.pdfIn PDF document text
    • http://biwewija.rf.gd/factors_affecting_evapotranspiration.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/velifakodasuveni.pdfIn PDF document text
    • http://kukadafimi.rf.gd/best_naruto_shippuden_game_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a2dc4ce-35ac-4cb6-abcd-eb50b1cb4924/56813532743.pdfIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_20f296e62a5b4479ad42cfb54a399c3b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/serinima.pdfIn PDF document text
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_ebdd43fa26e541a8919e201d34c93049.pdf?index=trueIn PDF document text
    • http://netomadutimafe.onlinewebshop.net/applications_of_nanomaterials_in_medicine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f687c5f6-fe46-457c-b0fb-ed36b090396a/87155529749.pdfIn PDF document text
    • http://bowegasobufur.myartsonline.com/milliken_vehicle_dynamics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bd47910-c6a1-4ccb-820b-126b49bd99a6/line_6_spider_v_240_mkii.pdfIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_a45f0a9332b04927bdb60dec820852d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jagux/programming_chamberlain_clicker_garage_door_remote.pdfIn PDF document text
    • http://gudukiderunusu.myartsonline.com/meaning_of_product_life_cycle.pdfIn PDF document text
    • http://pezajedoti.epizy.com/autosar_srs_rte.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c92d7dea-de43-4bba-85fb-728bacf40871/74273005519.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_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 5400 bytes
SHA-256: 52da39bba3cf281e0f2c1de20e2de888bfc1ebec7ae564a7753f75dd40ded06c
font_01_sfnt_off0001077a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077A 11448 bytes
SHA-256: 9b71d71cc7688793f0c4ced9bfc84ccc273315d9c90a2d58ca102d1984f38935

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