Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b80c951aa8e4f1…

MALICIOUS

PDF

75.3 KB Created: 2021-03-20 06:07:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0caf5d949de6900cc2e4f1797b478ff SHA-1: 7cf21067ddeb0620edf87d592e0d31687df4cd40 SHA-256: e2b80c951aa8e4f12e74d7ee518bba95eb9f6acd335dd5105c68301ea36ea715
156 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, including ClamAV. It contains a large number of external links, suggesting a link farm or redirection mechanism. The primary malicious URL identified is pelibifir.ru, which is likely used to host phishing content or redirect to further malicious sites. Although no scripts were explicitly extracted, the PDF structure and the presence of external links indicate a potential for malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wix?keyword=el+arrebatamiento+de+la+iglesia+vers%25C3%25ADculos
    • https://cdn-cms.f-static.net/uploads/4420766/normal_604eb0ba17a22.pdf
    • https://static.s123-cdn-static.com/uploads/4368741/normal_600759217b992.pdf
    • https://cdn-cms.f-static.net/uploads/4477629/normal_6009cf49d3ba3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tunenijexe/50419362518.pdf
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_4c17b526951d469d9296ddf20b1532b5.pdf?index=true
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_af47e9b7ad2f47569934acc94f388449.pdf?index=true
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_e9308b224cd0416e8539508a14b11dcb.pdf?index=true
    • https://s3.amazonaws.com/zesotat/vusenimelo.pdf
    • https://uploads.strikinglycdn.com/files/a1938a7e-37a1-4933-baf9-db72a1ca6c24/ipod_shuffle_not_charging_windows_10.pdf
    • https://s3.amazonaws.com/sizabo/check_my_starbucks_gift_card_balance.pdf
    • https://uploads.strikinglycdn.com/files/84687a8c-6eee-44f1-a747-47a3679cb228/sallys_baking_addiction_pizza_crust.pdf
    • https://s3.amazonaws.com/lorifumofelu/magic_tree_house_book_list_merlin_mission.pdf
    • https://s3.amazonaws.com/zatasipezeg/the_veldt_movie_vs_story.pdf
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_1ceaf257ff5d42b4b0301b2012f326ca.pdf?index=true
    • https://s3.amazonaws.com/mogedozara/are_mackie_thump_speakers_any_good.pdf
    • https://s3.amazonaws.com/gezejoputiwinu/95328410.pdf
    • https://s3.amazonaws.com/tinajabizoreguf/78910265441.pdf
    • https://uploads.strikinglycdn.com/files/7e136f1d-976d-4e30-bc62-18a493062b1a/64098640035.pdf
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_976d70bab87a4afe9a57db663c1bb3d5.pdf?index=true
    • https://4e4608fd-868e-43f5-b6ba-14e5e4b50785.filesusr.com/ugd/b1f235_f6b5008fac2b465eb39b1e59c1a9efe3.pdf?index=true
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_210aa3a7f1134ad389fa082aabe46023.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a0.bin
cd943a02e7e95005c93318452adfbe1684a0fe91be7ab79a0aec51aa25e43b08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A0 5468 bytes
font_01_sfnt_off0000f830.bin
5b8dc5dbb4d4d2bc9bdcb201d0a595c35ab1c513a1005eca11d85e31132afe7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF830 11532 bytes

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