Malicious PDF — malware analysis report

Static analysis result for SHA-256 5689b12a4239fab3…

MALICIOUS

PDF

82.7 KB Created: 2021-05-18 00:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c369e282bc1c1d67873af2d8caafd5c3 SHA-1: e28b01350106d83c695ec7d3686b7b659d1650a0 SHA-256: 5689b12a4239fab344a18015f86b70e306b5464b51fee1b17a59c08e2fdfba12
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files with numeric slugs, suggesting a link farm for SEO manipulation. One of these links, https://xajibur.ru/strik, is presented as a lure related to 'hall effect viva questions with answers'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded links point towards a malicious document designed to redirect users to potentially harmful content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/strik?utm_term=hall+effect+viva+questions+with+answers PDF link annotation
    • https://wokabilizivamu.weebly.com/uploads/1/3/2/7/132712023/nilomojesubexo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497646/normal_5ff88ec55d581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408464/normal_6058dfab7c244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485001/normal_6040c1f1c3e5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414174/normal_5feeaa7074bfb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375521/normal_5ff4358aa0639.pdfIn PDF document text
    • https://fimedezederuru.weebly.com/uploads/1/3/4/8/134884956/423752.pdfIn PDF document text
    • https://vosuxawa.weebly.com/uploads/1/3/1/1/131164537/zibamapomur-nawegubijexuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482218/normal_5fdbe74e9d169.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zukogi/zalivolorazikuzisiwiduxo.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/datisumaguwaxuluwulorog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fde7c7c4-07b3-4a0a-bc38-25102fa5d20b/does_my_xbox_one_controller_have_a_3.5mm_jack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22bd25cd-213b-4140-8196-80dfb2a8b865/alpine_cde_hd149bt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a38c59f5-62af-4f0f-aa18-63f10a50b42b/easy_piano_songs_to_play_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/asteron_life_change_of_address_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66514c6f-19d7-47b1-921e-10bf06dfcfe9/brother_hl_5370dw_drum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a57ceac5-1daa-4a50-a891-abfa0da5e494/jurumabujuxima.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_off0000ef02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 5208 bytes
SHA-256: 72f26eaad3804dcaa4d02f6be1f6b38228e8f3bd2806a1baf8e8e56df315797d
font_01_sfnt_off000100d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D4 11480 bytes
SHA-256: e5ee400475b55df37e820ce95cea9540a984b2ccb13124d78803e061e0f7e1a8
font_02_sfnt_off00012838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12838 16148 bytes
SHA-256: f2fe1b341ce625982f6229602509497cf1a9423964c663a7c58f6fce8010e377

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