Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f3e9da768b86d3…

MALICIOUS

PDF

83.2 KB Created: 2021-04-07 13:39:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c378565567805d5347429e81a56747d6 SHA-1: d5105bc146df047fe24ce221a3e842fdc186044f SHA-256: b5f3e9da768b86d3e230901afdc873810e5fd0a75333d4a969aaf2e9c2ed189e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://vilenefex.ru/wix?keyword=x8r+pro+manual PDF link annotation
    • https://nobawevedidilut.weebly.com/uploads/1/3/1/3/131379382/surofedifefobokitaj.pdfIn PDF document text
    • http://mateguwokalidub.getenjoyment.net/budget_allocation_2020_19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_602aadc7c3fad.pdfIn PDF document text
    • https://jibowosiz.weebly.com/uploads/1/3/4/6/134632869/4282696.pdfIn PDF document text
    • http://debodopox.iblogger.org/vidawisakelesaza.pdfIn PDF document text
    • http://bukupiduge.mypressonline.com/literate_programming_donald_knuth.pdfIn PDF document text
    • https://gumulopeviw.weebly.com/uploads/1/3/5/3/135348062/b7ef1.pdfIn PDF document text
    • https://zimatesuti.weebly.com/uploads/1/3/0/8/130873828/0be582cb638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_602f422350b37.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/41170e22-30eb-4d23-a982-f2a1c5623f2d/lidajimisovusenegusomob.pdfIn PDF document text
    • https://148d48ef-a78d-4e34-a4d2-755cfbac042a.filesusr.com/ugd/ccca9b_872f8638308c4ad5aa824d14f10ab7ba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0a8b4c7-ffa9-4a3c-a706-f128aa1b783a/47979789781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b65498-0f4c-4f0b-9e36-94e36d36cdea/how_do_i_update_my_mac_from_10.11_6_to_10.12.pdfIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_aaa6c716a914466bb25847985035c82f.pdf?index=trueIn PDF document text
    • http://vekowaxijoperun.rf.gd/gavanavavovar.pdfIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_4684d2a2b7364c8d9279794b2bd95e05.pdf?index=trueIn PDF document text
    • https://a6668164-4238-4e0d-addb-cc4c62f58fca.filesusr.com/ugd/2dfcca_2c9c0f432c2748bbb53321f93c2cd43b.pdf?index=trueIn PDF document text
    • http://memezuxel.epizy.com/tuwumemej.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_off000107ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BA 4960 bytes
SHA-256: a6f13cf6b3f018bc1685bb758fa10972f555f9bfd5a307cdda190b93e48d9c8f
font_01_sfnt_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 11908 bytes
SHA-256: a12451c1d023bb4af9fc8dbcaa48d2a6c73526d963ab7799436b78a0bdc57944

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