Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba329eaceed7ff1c…

MALICIOUS

PDF

81.9 KB Created: 2021-05-26 04:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6f73def229f868982d84d86acc05a93f SHA-1: 80a311a198c88e06af0c4c102fb21781940a3662 SHA-256: ba329eaceed7ff1c85a648014602afb6ec08e48769a0994481e9e13db0555545
186 Risk Score

Malware Insights

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

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 0.9967

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://ponafet.ru/strik?utm_term=how+to+write+appraisal+form+sample PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468814/normal_60696489bce59.pdfIn PDF document text
    • https://tevejokufip.weebly.com/uploads/1/3/0/9/130969131/b36d1cb619.pdfIn PDF document text
    • https://sumulepali.weebly.com/uploads/1/3/4/8/134882140/6082505.pdfIn PDF document text
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/7811fc00a0.pdfIn PDF document text
    • https://wakolixib.weebly.com/uploads/1/3/4/7/134706528/wutelupewoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393752/normal_60647bfc2bb97.pdfIn PDF document text
    • https://mufiwejugoj.weebly.com/uploads/1/3/4/3/134340856/zuvome.pdfIn PDF document text
    • https://pixelisikug.weebly.com/uploads/1/3/1/4/131407736/d00b7255d67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402963/normal_6046293abd305.pdfIn PDF document text
    • https://geserani.weebly.com/uploads/1/3/4/3/134347405/9584674.pdfIn PDF document text
    • https://xelegiri.weebly.com/uploads/1/3/4/4/134435730/5418150.pdfIn PDF document text
    • https://bigutorojorat.weebly.com/uploads/1/3/4/3/134352314/dopezubal.pdfIn PDF document text
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/4c206fe1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481520/normal_6009d0967caf1.pdfIn PDF document text
    • https://simisodiguguvig.weebly.com/uploads/1/3/5/3/135324772/bazokijijed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451760/normal_6027f94b1d53a.pdfIn PDF document text
    • https://wabibazo.weebly.com/uploads/1/3/5/2/135295983/2369473.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/siwixomudit/what_is_the_compaction_factor_of_fresh_concrete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d4525e1-9ea1-4d5f-8a09-f6acaedec086/ap_world_history_regions_map_college_board.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/66947035217.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/2546118079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f089abb-7755-436e-bc6a-66a65448a770/wordsworth_preface_to_lyrical_ballads_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e34349e-e2c2-4608-9c32-036cbdbd85d2/81043836867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1dcd8fb-a893-4c37-bf00-8757535718d1/nutiguxoberazixeta.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/dizozokigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bc46da2-5f00-40f2-846e-0667e39df247/what_elements_do_not_follow_the_aufbau_principle.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_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 5100 bytes
SHA-256: 4310ca4daf4a3d6939de0b73e466848a1f48650d47170c31ee6229134c9761dd
font_01_sfnt_off0001140c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140C 10580 bytes
SHA-256: 9e0a484c48c2427775de660e6adc2863e5da666e79fb8e4a578f09d12fe4eebe