Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18e4b07227fa7e8…

MALICIOUS

PDF

74.7 KB Created: 2021-02-17 11:32:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fe39849108dd0d6edd0342a94b09150f SHA-1: d78051276847fca06206d10219e770835ed794d0 SHA-256: a18e4b07227fa7e8df72efe0d87bbad54ca3ca8ae2e58c30f282cd75ddfd6585
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or conducting phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://baarspo.ru/wix?keyword=moocoo+cpap+cleaner+warranty PDF link annotation
    • http://bt-management.website/limitaciones_de_un_proyecto_de_investigacion9u4dq.pdfIn PDF document text
    • http://orbitan.fun/490546214717yqwo.pdfIn PDF document text
    • http://eeeeeyyy.space/city_of_ottawa_recreation_guide_swimmingfiim5.pdfIn PDF document text
    • http://zathkatow.xyz/114588849zi9b3.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/52714415747y0k47.pdfIn PDF document text
    • http://detonic-romania.website/nikon_shutter_count_software7itu6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416299/normal_5fda3988259d7.pdfIn PDF document text
    • https://tuxupurevulivi.weebly.com/uploads/1/3/0/8/130813143/zajofibuja-wawetebi-bevepeko.pdfIn PDF document text
    • http://zumasuxujole.22web.org/3086179840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_600d20a983315.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459175/normal_5fe22bdfd2ea9.pdfIn PDF document text
    • http://copyright-notice-ig.com/422913465441q3vd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tumewadeb.epizy.com/anaconda_3_movie_mp4.pdfIn PDF document text
    • http://gobewodekopatu.epizy.com/eclipse_oxygen_for_linux_32_bit.pdfIn PDF document text
    • http://laxolivavaru.epizy.com/police_report_number_ontario.pdfIn PDF document text
    • http://sixofiwezuxowa.epizy.com/40067662789.pdfIn PDF document text
    • http://gadiwovujema.epizy.com/s5971_photodiode_datasheet.pdfIn PDF document text
    • http://gawekavadave.epizy.com/gapinibukukusuvujenaxul.pdfIn PDF document text
    • http://vulekagezefodek.rf.gd/ias_14_segment_reporting_summary.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_off0000e8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 4948 bytes
SHA-256: 772cf4f71cf2571faa36a607c2528c16ca4d8acd6e297db92037fe4776318f59
font_01_sfnt_off0000f9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CA 10472 bytes
SHA-256: a707cfdb0926c35dccce64796dc45807aec9afb1b5887abdca0a89ba7529f046

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