Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5afb3ea61b1c39…

MALICIOUS

PDF

77.9 KB Created: 2021-06-07 23:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c8a3a86e0c47b342d8fb01d83b4a444c SHA-1: d238532389f6d0392b114ab0b544e55a3dec11e5 SHA-256: 4a5afb3ea61b1c39e4357826854f0da8e03b95aef52184a74d5c840881b71f33
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO link farms or phishing lures. The presence of these links suggests the document's primary purpose is to redirect users to potentially harmful content or further stages of an attack.

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://fokemale.ru/123?utm_term=as+white+as+a+sheet+l%25C3%25A0+g%25C3%25AC PDF link annotation
    • https://jatilesaza.weebly.com/uploads/1/3/4/3/134316516/49a94377d2a.pdfIn PDF document text
    • https://zukifetev.weebly.com/uploads/1/3/4/7/134725253/3421529.pdfIn PDF document text
    • https://kujakaxu.weebly.com/uploads/1/3/5/3/135347331/fomamej.pdfIn PDF document text
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/8030423.pdfIn PDF document text
    • https://tatazopizen.weebly.com/uploads/1/3/1/1/131163492/xenegizesaro-sagit-revugut.pdfIn PDF document text
    • https://fikelepokaretes.weebly.com/uploads/1/3/1/3/131397971/81c824c4cdd7.pdfIn PDF document text
    • https://fafetomipisiso.weebly.com/uploads/1/3/4/6/134603542/6517067.pdfIn PDF document text
    • https://buneresax.weebly.com/uploads/1/3/4/4/134478328/rifobatoxuvedasitoli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fudejob.pbworks.com/w/file/fetch/144504720/what_does_wham_bam_thank_you_maam_stand_for.pdfIn PDF document text
    • http://zawepiko.pbworks.com/f/fun_maths_worksheets_for_10_year_olds.pdfIn PDF document text
    • http://refarumiba.pbworks.com/f/38192680105.pdfIn PDF document text
    • http://josinibugaju.pbworks.com/f/akbar_birbal_comic_story_in_hindi.pdfIn PDF document text
    • http://gapufipi.pbworks.com/f/download_sketchup_2018_crackeado_32_bit.pdfIn PDF document text
    • http://fujiserefi.pbworks.com/w/file/fetch/144680121/how_do_i_setup_my_xfinity_remote_to_my_cable_box.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/f/xesebulotunusuwoniv.pdfIn PDF document text
    • http://furalagaposu.pbworks.com/f/39851510511.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/95889386425.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/w/file/fetch/144491880/vusamazulu_credo_mutwa_books.pdfIn PDF document text
    • http://jinotofatum.pbworks.com/w/file/fetch/144677097/20678245654.pdfIn PDF document text
    • http://vakerul.pbworks.com/f/how_do_i_write_a_letter_requesting_an_outstanding_payment.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_off0000e4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E2 5220 bytes
SHA-256: a068b7c8be32d7af8a5f23ba35b35a10113062a1cf0019fc7ff169406a9c3acc
font_01_sfnt_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 22492 bytes
SHA-256: 2cc75de375c7e76359dca772e194eba2eed4967796db2249af9e547c0f244e88

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