Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c1c1f6f013883f…

MALICIOUS

PDF

70.3 KB Created: 2021-03-31 11:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c0b30dca31056656112c242e43c53a12 SHA-1: e718b1eefc91b4f20c0d002093463c2bf857294b SHA-256: d3c1c1f6f013883fa1437a03bff78fa24aa081c7ac55a27c5942435c0e3bc31c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous external links suggests a potential for distributing further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nipisod.ru/strik?utm_term=invisible+cities+author+calvino+la+times+crossword PDF link annotation
    • http://ravigimojamel.mypressonline.com/ibps_exam_books_free_download.pdfIn PDF document text
    • https://gitokivoj.weebly.com/uploads/1/3/4/3/134316846/bibitozubezewax_mupubuke_zezizezer.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/530cf577.pdfIn PDF document text
    • http://auto-agents.space/celine_dion_sheet_music_free7rpcn.pdfIn PDF document text
    • https://piwebodowumogoj.weebly.com/uploads/1/3/4/8/134857209/d1cfba2ee5c3450.pdfIn PDF document text
    • http://ruvujagefeko.mygamesonline.org/kitab_al_arabiyah_baina_yadaik_jilid_1.pdfIn PDF document text
    • http://xafawotilujos.mypressonline.com/dd_new_warlock_subclass.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/pasar_documento_de_a_word_gratis_en_linea.pdfIn PDF document text
    • http://gepanukotex.getenjoyment.net/82923817430.pdfIn PDF document text
    • https://xanowiporak.weebly.com/uploads/1/3/0/8/130814060/8419572.pdfIn PDF document text
    • http://hargotel.xyz/amana_portable_air_conditioner_14_000_btu_manual9b3ej.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/mixup.pdfIn PDF document text
    • http://xojanefod.mygamesonline.org/xuride.pdfIn PDF document text
    • http://reduslim-shop.site/sopumoxigujevajupafadifj8kyc.pdfIn PDF document text
    • http://konolux.medianewsonline.com/pdf_to_word_converter_software_download_full_version_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://givetupazowo.onlinewebshop.net/gazasogir.pdfIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_00e9f5d1cd584dd78733c17a6d5ab4d3.pdf?index=trueIn PDF document text
    • http://namakanexir.atwebpages.com/athens_greece_bus_map.pdfIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_26d52d58ead543e5b57df3ae0b0cb3ce.pdf?index=trueIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_5db35336be784b6d9b90c8480d9cefad.pdf?index=trueIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_3001c24e651046ab8dd0d319bd271092.pdf?index=trueIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_6cf463e0e52741538ed559ae8a27453b.pdf?index=trueIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_78ca7a30f09a4afd998cad57469e6076.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_bf8d159f92684f1eb2a0d72492746244.pdf?index=trueIn PDF document text
    • https://28ae28a3-27cc-4d38-be83-0de1f6925f83.filesusr.com/ugd/454016_3e827cfd616245dcb6f02f505ff26f67.pdf?index=trueIn PDF document text
    • http://matewedidoxeber.onlinewebshop.net/71314840584.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_off0000d578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 5408 bytes
SHA-256: 8dc32103ed886d4319d1cf36008e498c8417988804899bc222e046a0742f799e
font_01_sfnt_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 10712 bytes
SHA-256: 0a802b5abb39a57610cf71221936f26154047346167ca3fcda0da35d31018635