Malicious PDF — malware analysis report

Static analysis result for SHA-256 6305b77376715709…

MALICIOUS

PDF

81.4 KB Created: 2021-03-13 16:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d011295840abca2ebd0d614bf12a2f94 SHA-1: 4f643877b4dce48d1bb29d36b66cc6ef81388824 SHA-256: 6305b77376715709fe87ec59f64bbd2ef8728f8ce590b5b449ea669769fc2062
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external domains, including one that redirects with a 'utm_term' parameter, suggesting a lure to a malicious site. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, but no clear instructional text. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

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
  • 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=what+are+the+structural+differences+between+dna+and+rna+quizlet PDF link annotation
    • http://gupirigugorixuf.sportsontheweb.net/85004334714.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470019/normal_5fcd88726e5fd.pdfIn PDF document text
    • http://gtmedis.com/pimoxepamovivalarav8zia.pdfIn PDF document text
    • http://nariwunuzaw.scienceontheweb.net/duwogumubuwuvitapisamegut.pdfIn PDF document text
    • http://pifowovumuwe.medianewsonline.com/how_to_pair_singing_machine_bluetooth.pdfIn PDF document text
    • http://kamini33.ru/jejiwopawunojikifo1c3y.pdfIn PDF document text
    • http://job-finder.space/65291859308p0k94.pdfIn PDF document text
    • http://mif-smeh.space/59101969008swnpf.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/api_510_inspector_salary_in_canada.pdfIn PDF document text
    • http://otomail.business/echo_pb-250ln_fuel_line_diagram7rgbj.pdfIn PDF document text
    • http://subbellassecret.com/vokuwexisajazosaxob3ktg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424682/normal_601de9de26c5a.pdfIn PDF document text
    • http://cashbackmoney.info/paint_by_numbers_for_kids_onlineb0lbt.pdfIn PDF document text
    • http://montana-media.com/venn_diagram_3_circles_problems_with_answers51c49.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/retisovojor/12357163478.pdfIn PDF document text
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_2c7a00867e91432abc43577bce0cdf7d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/jepanegilivimuni.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/88108031106.pdfIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_a848cc6bafb749f19812ce26bd414183.pdf?index=trueIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_98b2453b42c243e6a236989dd0acde2c.pdf?index=trueIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_afe731ec7d67479a92ff78f074ab1947.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fogibi/16578075499.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/23437953968.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/road_trip_itinerary_planner_template.pdfIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_71f253398cd9491e9dad75eab0169e1e.pdf?index=trueIn 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_off0000fe86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE86 5532 bytes
SHA-256: 9d45b850a9aba4ce7c4e38c60c8c4b6f9341c1e687ccca36fe93fac778669f7b
font_01_sfnt_off00011169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11169 10528 bytes
SHA-256: 48da76368eaf18778d1295ef51b8c7f247244eac332725dc336ffaaf2d774288

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