Malicious PDF — malware analysis report

Static analysis result for SHA-256 23603c7ba98ace20…

MALICIOUS

PDF

80.2 KB Created: 2021-05-28 11:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3d918f3ec5181853008da9b1c14367a3 SHA-1: 267658a193a6d608f280ca61df47ac73df160783 SHA-256: 23603c7ba98ace209de3358e39b8fe4d71c92cb19a666b2253f702139ce48278
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The embedded URLs likely lead to further malicious content or phishing pages. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=what+are+the+3+main+type+of+reading+strategies PDF link annotation
    • https://lesesaxaxutetu.weebly.com/uploads/1/3/4/6/134613106/funujubot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443326/normal_5fc9d5e734ebf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386620/normal_5fc68323b5c04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403820/normal_6023b9a0650e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426072/normal_6016cbb7ebb24.pdfIn PDF document text
    • https://derovidexaw.weebly.com/uploads/1/3/1/3/131382126/d7440d2fe9.pdfIn PDF document text
    • https://makaxifosezopuv.weebly.com/uploads/1/3/4/5/134511124/290750.pdfIn PDF document text
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/zukewe_gijozumif_torito.pdfIn PDF document text
    • https://nojuguxupibubir.weebly.com/uploads/1/3/1/4/131438610/jetumaliwekeri.pdfIn PDF document text
    • https://nixabuvibowigev.weebly.com/uploads/1/3/4/3/134308208/e7fa162bcbf.pdfIn PDF document text
    • https://janilunulosuga.weebly.com/uploads/1/3/0/7/130739392/jojiguzurinidoj.pdfIn PDF document text
    • https://lujogome.weebly.com/uploads/1/3/4/6/134617312/b3c3ebe7da521aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408701/normal_6008c04fcc6b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488842/normal_602c3085c9a9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_606e1f770db46.pdfIn PDF document text
    • https://mukuriwubi.weebly.com/uploads/1/3/1/4/131483253/9929752.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/b18f88ce-a2fd-47c1-8e46-41fa8557c2c2/geparewonavemavolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f73d20b-2e6a-44b0-81e3-6cf024db0333/how_to_install_vtech_cordless_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f71b1044-f461-460a-9d96-d8ebb6c5aeb7/acer_aspire_v5-571_battery_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/133cb3f4-280e-4c8e-b7d2-2d1b18fe4334/terry_pratchett_tiffany_aching_reading_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/352a14a9-9d49-422a-a744-c7257ecc743a/how_to_get_a_ny_enhanced_drivers_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d5a2e28-00d7-4ac7-a82a-d1218dd55ce2/lakefi.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_off0000fa91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA91 5700 bytes
SHA-256: 369542bee81b82c6cae672d6b64f3c84a5b012d214c326809f207fafb9e761e2
font_01_sfnt_off00010dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEA 10840 bytes
SHA-256: cac066b4b3a53041e7d6052f5b376bcd59bc07bcc47c0346d4238a722d467164