Malicious PDF — malware analysis report

Static analysis result for SHA-256 4094c6727cb88af8…

MALICIOUS

PDF

91.6 KB Created: 2021-03-31 14:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5b078640164332350b5a84ea678437e0 SHA-1: cec49aaf6ecf2752c029b75ed0f32d492562a177 SHA-256: 4094c6727cb88af8a495ce10f9a9edacd48da8027c6599a1bbe06a483e550e67
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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/123?utm_term=ignite+react+native+templates PDF link annotation
    • http://wipebodu.mypressonline.com/58695185945.pdfIn PDF document text
    • http://lijazojomuzawo.22web.org/define_annotations.pdfIn PDF document text
    • http://zenaxudoriw.mypressonline.com/basic_grammar_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_65199a7a503f4e709a41924268c0e3ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad050b71-ba51-463e-9bdb-1f9bb646fcfa/fazazewi.pdfIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_81c927048f664027adf1b3979e15bacf.pdf?index=trueIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_bc4a58f8076c4021a00765937ab779a8.pdf?index=trueIn PDF document text
    • http://nopugorib.onlinewebshop.net/doguvatoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8efdb21-7d89-4102-8ccd-4389f04b3000/wuwewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c961510-3d02-4561-ad35-f4c512ba2c2b/what_is_it_called_when_a_phrase_has_a_double_meaning.pdfIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_7d42c8f234ba4f0983aa4c7f407e5842.pdf?index=trueIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_a2b248040b254b9fa11351da47f6581b.pdf?index=trueIn PDF document text
    • http://lapakak.rf.gd/samsung_balance_sheet_2018.pdfIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_965e6b6853574411ab3bcaf14001de1e.pdf?index=trueIn PDF document text
    • http://zuriromaruwo.epizy.com/a_room_of_one_s_own_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c4954a7-b8d9-4d4a-bd16-6c5f1388d6e7/motorola_minitor_v_amplified_charger_accessories.pdfIn PDF document text
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_d7585c9dcff8479897ad3abce9882375.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b75673cd-5cdc-407d-921d-e63c7490d526/jevudetukimobapa.pdfIn PDF document text
    • http://mudivakerimenog.epizy.com/3452299090.pdfIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_052ad72912404a24a729d88dc4e52ee6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ca4270-cdcd-4063-86c5-565ef1964cc2/moziseji.pdfIn PDF document text
    • http://vilumepidiwego.myartsonline.com/perilisij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0553fc9-9165-4928-942a-7f9c28f9fd3a/mary_poppins_returns_cast_from_original_movie.pdfIn PDF document text
    • http://loratozojakin.epizy.com/excel_weekly_calendar_template_2018.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BF 5248 bytes
SHA-256: b49c37fa717460d864843ae9d4c44713dcb43e7be0f27f1f929fa4af5b5a65df
font_01_sfnt_off0001238f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238F 11604 bytes
SHA-256: 78b449c8bca00c677f5d5d4fcf9ba626e38f1bd0c9211c22503cd995934375ea
font_02_sfnt_off00014b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B70 16116 bytes
SHA-256: 5ec139a263af45d7cbac1bc1a000173eb4e7f97797aba0f35ce2e37505b4886e