Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81f4d3bb5ab17c4…

MALICIOUS

PDF

84.3 KB Created: 2021-03-22 05:58:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5d068cd962759c2312f4bc60e6162624 SHA-1: 5c52e16366228bdf4b414972acd4d403729fbd73 SHA-256: a81f4d3bb5ab17c4004377bf15d152f5f4f56bcb8305e3e26ebfd2bc9bf3c2ef
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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 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://gimoguvi.ru/wix?keyword=lord+of+the+rings+pdf+piano PDF link annotation
    • https://cdn.sqhk.co/wiwokosokif/ihgh0bQ/rujuw.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/FhFjc9s/10246722150.pdfIn PDF document text
    • https://xibomuwupipufa.weebly.com/uploads/1/3/5/3/135389044/9086e6da976370.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/d4lbggf/zipobegoxatakufapigej.pdfIn PDF document text
    • https://milatesedupodil.weebly.com/uploads/1/3/1/4/131437919/xaxuzevavewav-zesaxen-desugumug.pdfIn PDF document text
    • https://gituruledutaza.weebly.com/uploads/1/3/4/4/134401886/norivimitiwudilarid.pdfIn PDF document text
    • https://vabuxijipureg.weebly.com/uploads/1/3/4/4/134476882/refokojotus.pdfIn PDF document text
    • https://cdn.sqhk.co/gozigawefo/jizzggQ/health_and_nutrition_dissertation_topics.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/hgiggcF/dj_ambarish_song.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/giijgjO/kisumoxixokaw.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/f3DhczS/92478741424.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/jiibmhg/13129440098.pdfIn PDF document text
    • https://reravojune.weebly.com/uploads/1/3/1/4/131406269/6cb900ca.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/ibz4Akf/16724407031.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gaxapokone.epizy.com/taxajotupefoputepofuxolo.pdfIn PDF document text
    • https://a29d81ee-e589-4368-99bd-4e0be04eb4c0.filesusr.com/ugd/a89e6e_851fdbc88265414ab56ef9adb7e8c45e.pdf?index=trueIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_56a10aa26fdb487486a144cf05ccc853.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/26628337846.pdfIn PDF document text
    • http://popudedakajani.rf.gd/couch_to_5k_running_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/high_density_rigid_foam_sheets.pdfIn PDF document text
    • http://rubigireluj.rf.gd/analisis_semiotico_de_la_pelicula_el_nombre_de_la_rosa.pdfIn PDF document text
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_559a3649e9b84a34a5112cbc74b6824d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kavalukato/13344632548.pdfIn PDF document text
    • http://xomedejufe.rf.gd/gogilafur.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/58852214691.pdfIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_af19e17e57684ea08284a547cbcb17d3.pdf?index=trueIn PDF document text
    • http://famefikapipu.epizy.com/galokutojuvubotaf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 5000 bytes
SHA-256: a3a767952a29859f4e3e5141a3d65abedb2104a78369ce5db5d832dca5b0b048
font_01_sfnt_off00010ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE8 10932 bytes
SHA-256: b2216c1e7fd284572b4696604017e11118874e1ddfe774c6fd7795c30902215a
font_02_sfnt_off00013417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13417 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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