Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fee481d275672fb…

MALICIOUS

PDF

135.3 KB Created: 2021-05-04 04:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1f13fe9e2e612294e27577a92dfbb1ea SHA-1: 2e1d5eff9bef644c0f07987ace5e3a74daec87ec SHA-256: 4fee481d275672fb2615b6c24a3c4b435152f7d7d24e1cc6b6f1eeb216a84cf2
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a significant number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially harmful sites. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 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://nipisod.ru/strik?utm_term=north+atlantic+fleet+ww2 PDF link annotation
    • http://fipagolanikobax.mygamesonline.org/design_thinking_handbook.pdfIn PDF document text
    • http://mazers.fun/valoxewejigumamowezazovuj3o66c.pdfIn PDF document text
    • http://jajuviramigawo.medianewsonline.com/our_world_phonics_1_download.pdfIn PDF document text
    • http://coolvdomaion.online/storyboard_creator_software_free_downloadlpgil.pdfIn PDF document text
    • http://kevekozulanilim.sportsontheweb.net/pesquisa_em_educao_abordagens_qualitativas.pdfIn PDF document text
    • http://grigolia-studio.ru/aaa_defensive_driving_course_answers15m0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461495/normal_5ffc310295c81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383573/normal_60691925d1ca7.pdfIn PDF document text
    • http://fejiximodanu.mygamesonline.org/bbc_compacta_class_11_english_answers.pdfIn PDF document text
    • http://pet-guru.shop/11857549595xzbjd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_60135e875b020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://19eae752-0dc2-40b2-988a-3ead9c543f91.filesusr.com/ugd/dee0a8_742f33547f7a4a76b3cfc23c3271a502.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0431ad3-854b-4943-9443-5f0ef290368e/properties_of_matter_lesson_plan_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e6cad5b-0876-4549-b88b-4f114ab2b36f/nejupaxojajozirul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab96349-97d2-487c-b2a2-0fe5b964b052/oxygen_49_iv_review.pdfIn PDF document text
    • https://1794ee33-230d-455b-98b1-84d48067edce.filesusr.com/ugd/551769_033199e1bba74f4c8c4949995eff3e71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f30e9f25-80cc-441c-a391-971c316741d9/what_does_it_mean_if_it_hurts_when_you_look_up.pdfIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_38f9ec8de2c9405793c9deb12ef34cef.pdf?index=trueIn PDF document text
    • http://woxesizefibugel.atwebpages.com/97333370589.pdfIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_02965a26b38b48808fb631c5cbe61771.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d559d9b9-2961-47e1-b755-01c198a3661c/48338071740.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_off0001d818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D818 4984 bytes
SHA-256: a4f9f25edb5964560d56e07a4e0a792da14d514073e815abb17a60b33d7b35ef
font_01_sfnt_off0001e921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E921 11912 bytes
SHA-256: e04fb9a8b51019049964fad075134576a06a7e97f6c0140f9b427761900a9642