Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc2a2906a014b3c4…

MALICIOUS

PDF

77.3 KB Created: 2021-03-11 09:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0d186bd506da25f90652a8d2097fcb0b SHA-1: 4c89ab831bf5f4bad45a775076e10a1882999e3b SHA-256: cc2a2906a014b3c4bdf159325273b7992fce31e8715550f13ec7a22fbbb8b296
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming attempt. The ML classifier also flagged this PDF as malicious with high confidence. The primary purpose appears to be directing users to potentially malicious or unwanted content hosted on external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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://xezojetit.ru/award?keyword=socialism+versus+capitalism+pdf PDF link annotation
    • http://xizerunax.scienceontheweb.net/98495380024.pdfIn PDF document text
    • https://zotujoku.weebly.com/uploads/1/3/5/3/135304148/letedujanefasewugisa.pdfIn PDF document text
    • https://xeludelibiw.weebly.com/uploads/1/3/4/3/134371965/9174807.pdfIn PDF document text
    • http://vulufinagi.mypressonline.com/lexajixidowolotanob.pdfIn PDF document text
    • http://canonsburglake.com/kidumelelasidigabididiz1qlug.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/yoga_vasistha_books_in_telugu_free_download.pdfIn PDF document text
    • http://auto-agents.space/your_husband_calling_ringtonesjnkbd.pdfIn PDF document text
    • https://referozudu.weebly.com/uploads/1/3/0/7/130775612/setodavetawasemidudi.pdfIn PDF document text
    • https://ramemegu.weebly.com/uploads/1/3/1/3/131383760/545573.pdfIn PDF document text
    • https://romuxejis.weebly.com/uploads/1/3/4/8/134887308/besozakasa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7305246e-e396-4370-92f5-515949c68f0c/singapore_math_workbook_grade_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b446d3-182e-4c45-b365-994873c82dd7/kilolemuwidexokesaxolo.pdfIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_94d369eb6dc743f5a021039bc82e7085.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12f62857-5607-4eae-a7f2-3dc7063cc0db/bella_waffle_maker_recipe_book.pdfIn PDF document text
    • http://kunipotow.epizy.com/diseases_caused_by_staphylococcus_aureus.pdfIn PDF document text
    • http://fejolisevew.rf.gd/tapuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cd5c6de-b182-49e0-8333-712d4595fe30/sears_lawn_mower_repair_manual.pdfIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_2d56ec683a5840cb888d99e72c02c850.pdf?index=trueIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_f8f1de80b11c47d1b528a2564119f4c9.pdf?index=trueIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_86c702cd86034f28ad2875c6bd54fb87.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92582f5a-ba87-4674-a42d-6f69c6003254/12593343350.pdfIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_4bc79de7a228406581213e756227ab68.pdf?index=trueIn PDF document text
    • http://jodunobu.rf.gd/monster_girl_quest_wiki_sara.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_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 5464 bytes
SHA-256: 886278cf2e17b1e6aa75819daf6ea348960b49f979c787e7c5844f948d03ce57
font_01_sfnt_off00010387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 10608 bytes
SHA-256: ae335140d0e04fe8b1d63296e078a8bcf38f68ec6f23d521d0ff69c3f84e30d8