Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ef349520e7f773…

MALICIOUS

PDF

77.6 KB Created: 2021-06-03 20:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a69761e3c361d6c6beac70e93ef9558c SHA-1: 11f1ff3ee9d5b5a1196ec3364965f08a825e602a SHA-256: c1ef349520e7f773b169d2b5372bfb324fba4478ceb8d8a95acef41f6575aa45
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

Heuristics 5

  • 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 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://synerhu.ru/pbw?utm_term=tam+say%25C4%25B1larda+d%25C3%25B6rt+i%25C5%259Flem+sorular%25C4%25B1+9.s%25C4%25B1n%25C4%25B1f PDF link annotation
    • https://dafizoxov.weebly.com/uploads/1/3/5/3/135309439/3140158.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467912/normal_5fee41cf79f0f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4465149/normal_60b6ff194a98f.pdfIn PDF document text
    • https://meripowubizaj.weebly.com/uploads/1/3/5/9/135959363/202aa9c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454289/normal_60086f0e56884.pdfIn PDF document text
    • https://senuwisaf.weebly.com/uploads/1/3/4/0/134018119/turexigewoliwe-godudibelivapek-gogiriwotadar-loxor.pdfIn PDF document text
    • https://wusumojasojufe.weebly.com/uploads/1/3/4/3/134352244/111216d16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419827/normal_5ff553fada3bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450156/normal_603b911c08c02.pdfIn PDF document text
    • https://fafafupoxojamu.weebly.com/uploads/1/3/5/3/135350358/pidor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c042c7d3-1c4d-4a8d-8139-dc6175b1c2c2/tilobawiwonoditetumob.pdfIn PDF document text
    • http://fokojifidesi.pbworks.com/f/97615779901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58081af9-1d96-421f-8d98-d40c7069e3dd/17601181310.pdfIn PDF document text
    • http://pojaweku.pbworks.com/f/business_english_book_for_beginner.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/what_is_breakdancing_all_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a85bc43b-c944-4b23-b624-f0fa1fc008b1/bubble_test_sheets_print.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/w/file/fetch/144455235/aki_ola_series_core_mathematics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55acb534-7636-4e79-b8b1-1aa43069a8ca/tidinab.pdfIn PDF document text
    • http://ritijix.pbworks.com/f/percy_jackson_and_the_olympians_book_one.pdfIn PDF document text
    • http://magogopowo.pbworks.com/w/file/fetch/144461694/seeleys_essentials_of_anatomy_and_physiology_10th_edition_ppt.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/f/how_to_use_allshare_play_on_samsung_tv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 5592 bytes
SHA-256: ce0d87e4e56d8917d718e31027a01e2e65b0cf67fdefab45bd7e861ae1e77097
font_01_sfnt_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 12856 bytes
SHA-256: 749f6f1c31f2040d296338391e8e342130eb7360bfde36a325b513f41536fd42
font_02_sfnt_off000117f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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