Malicious PDF — malware analysis report

Static analysis result for SHA-256 909a0b3f214e766f…

MALICIOUS

PDF

85.4 KB Created: 2021-04-08 08:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1fb3b2036c3e5e1cd6d7b48b4a68ffa1 SHA-1: 110ad5d7c0c2fa788c8fd9c65781b60d9cd13d30 SHA-256: 909a0b3f214e766ff74f6878f7e8f8f68a56bef7c10518424b881f7447a7f627
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 0.9993

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=coliformes+en+agua+residual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426953/normal_5fe8100f29dab.pdfIn PDF document text
    • https://dodezugufiz.weebly.com/uploads/1/3/5/3/135331092/zisuxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470836/normal_5ffcb5063f89d.pdfIn PDF document text
    • https://xajapeni.weebly.com/uploads/1/3/4/3/134341300/velufekolukosiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_6046eb2ea6c18.pdfIn PDF document text
    • https://dawutika.weebly.com/uploads/1/3/1/4/131407504/numilugufeloj-gagib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369797/normal_60004b39ed22c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422622/normal_605f3760a34af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461525/normal_602169c524232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376875/normal_6057fb517187e.pdfIn PDF document text
    • https://tuxupurevulivi.weebly.com/uploads/1/3/0/8/130813143/tagiduwir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462096/normal_60384bae1ad27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454966/normal_5fe5512a0e09f.pdfIn PDF document text
    • https://gikemadisasov.weebly.com/uploads/1/3/4/6/134667176/1808483.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443371/normal_5ff828fdc8a88.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/fedojigudaj/check_writing_software_free.pdfIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_8997ce032132497d8a83f10aaf0e1a3e.pdf?index=trueIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_d2b284e2dea4498d9a28c4f5f5a3e6df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/bekhayali_song_free_djpunjab.pdfIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_89b71ee56519474cb2ff34457ac18414.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupijila/segul.pdfIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_b897ce55e80243e29a84af06dd9d8911.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokit/pivevexodivolabem.pdfIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_b956c97a485d4775a36117ed763fcff8.pdf?index=trueIn 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_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 5132 bytes
SHA-256: b3f98a79654a963aea2350f619772bc25320ccfb64fc3247f6b6654acda83653
font_01_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 12444 bytes
SHA-256: 380d772aac8e88403d4a713cdc8dca532d18ddb2747bef7314ecbfb5bfc3981b