Malicious PDF — malware analysis report

Static analysis result for SHA-256 061fbb44509822fc…

MALICIOUS

PDF

111.9 KB Created: 2020-11-11 15:12:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c4a9a63e39968937514e0534866fa1c6 SHA-1: 143796fb19386ef6bda3394562335006b158ddc4 SHA-256: 061fbb44509822fc46f1b4e6d1d16c20397d9f65f6936c60d286ddf77180de41
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafffi.ru/123?utm_term=different+types+of+quadrilaterals+notes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368248/normal_5f881939ee565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408858/normal_5f973c4765a1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_5f9d6fc291f0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451766/normal_5faaede42ac0d.pdfIn PDF document text
    • https://luxexawasoju.weebly.com/uploads/1/3/4/1/134109261/jugivabifutidi_gezujevipev_fopiwupo_zerogejivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388280/normal_5f91d520961f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_5f8efd3f21969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407793/normal_5f93e9e56a3bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375351/normal_5f952e5fae046.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_5f9a30a497d6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390373/normal_5f970e49046f2.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/pusumowi/90318705636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e682673-4bb0-454a-82b5-9e6e014b651c/wovoxusoxikaperujiwofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae1d40c-3859-4c90-8b2c-c93bbf5fc700/18966663444.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/bodabuguri.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF3 6500 bytes
SHA-256: 1b3afb5dc8d15c4064ce8c4487f33ae88a40fc73fbe974b970ce216cc92458cf
font_01_sfnt_off00014c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C27 5260 bytes
SHA-256: 556b3908a1e7615d82fb5df835105237a1793fb56c78a82fc9db8c39df6a04d2
font_02_sfnt_off00015e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E2E 13328 bytes
SHA-256: 65ca0a24c6cd9c869ecad73ac8f5d418b8d0f813eb1ea3c37b8e61732a68d67f
font_03_sfnt_off00018b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B01 16280 bytes
SHA-256: 2cd7f4b4b61af291f0366ce7a10035560ed2a508ea471dc8a76a6701aee1beb3
font_04_sfnt_off0001a0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0AE 6464 bytes
SHA-256: 1995d0fae8465aa7fe0c494bff25ad604eadd96db0f91852d46d0f39470f057d

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