Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6e72194e191ff4…

MALICIOUS

PDF

75.1 KB Created: 2021-04-22 07:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fcf91d93be689ff705478653622df37b SHA-1: 1181149ebe7b0af07c8808e6f56e7351d0b2d996 SHA-256: 7c6e72194e191ff46b923a5edb0f25d03e55790f0a580e037ec7308d6a82bbff
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, including one that appears to be a phishing lure related to calculator programs. The presence of multiple external links and the nature of the primary URL suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=ti+84+ce+calculator+programs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381735/normal_604d805e6541b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382429/normal_600c85a9a925e.pdfIn PDF document text
    • http://xepuxesadara.mypressonline.com/bloomfield_contribution_to_linguistics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_60412e567025f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450728/normal_603e428070d91.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/3hNVzgh/nevorasudimosabuzaduboso.pdfIn PDF document text
    • https://cdn.sqhk.co/mewoveri/geagOgg/online_hotel_reservation_form_samples.pdfIn PDF document text
    • http://buzevuzelape.mywebcommunity.org/apprendre_le_russe_avec_ania.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/0150f6b6-052f-4b5f-ac34-f2d71c5c858b/python_list_comprehension_else_pass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67787b77-34ff-4edf-baae-c7a4c79d5eb4/whats_the_meaning_of_the_word_potato.pdfIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/maths_formulas_for_class_11_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/687a94b8-0857-44d9-b1d8-8dee50eb6d7c/nemajumusovazajidobe.pdfIn PDF document text
    • http://legokejapo.atwebpages.com/91669788202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a5d0de1-51c4-4a57-966d-ac30c831f6c0/14925486523.pdfIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_57faa81b3aa74674a6585a356a2b9139.pdf?index=trueIn PDF document text
    • http://pabotojixupi.atwebpages.com/65642817419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b93175-ea5b-474f-a4e2-8b57c45ea19c/death_note_light_shinigami_theory.pdfIn PDF document text
    • https://16cc4848-9a85-487f-bc1d-da55f68f8448.filesusr.com/ugd/dcf86b_501b985a1fd741f4b56984fb49c06cd2.pdf?index=trueIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_03ba55414f554813aae37157baf4393d.pdf?index=trueIn 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_off0000e5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 5484 bytes
SHA-256: 496fe60650ee317e84c94fe142c7e078586e749159b4148600dd0dbd05f0e870
font_01_sfnt_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 10892 bytes
SHA-256: 6b3e6121c1f4eaffbab19a6ee19396fcb584c549897abdd1cff04ca95094f8ac