Malicious PDF — malware analysis report

Static analysis result for SHA-256 15fef91ef1aca897…

MALICIOUS

PDF

66.2 KB Created: 2021-04-01 15:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 19d98c44866b68d20c5aacadd2bedbd6 SHA-1: 234178d3b452a64e0007b4ea68ce7a9af3701ed7 SHA-256: 15fef91ef1aca897769bc76f7a90c6f046e6acb4a7ada4f66518f0563f07527c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous external URLs, with one notable URL being `https://dugedepap.ru/aws?utm_term=how+to+calculate+net+income+formula`. The presence of a large number of external links on disposable hosting suggests an attempt to obscure the true malicious destination or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9263

Heuristics 5

  • 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
  • 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://dugedepap.ru/aws?utm_term=how+to+calculate+net+income+formula PDF link annotation
    • https://pujelewi.weebly.com/uploads/1/3/4/0/134017294/9171358.pdfIn PDF document text
    • https://vejewumuwuwaja.weebly.com/uploads/1/3/4/7/134759129/e2920.pdfIn PDF document text
    • https://zubosevofugojat.weebly.com/uploads/1/3/4/3/134307347/d382fc.pdfIn PDF document text
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/kuberewizuwemilelo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418963/normal_5fe4253fbd245.pdfIn PDF document text
    • https://tuniforokot.weebly.com/uploads/1/3/2/6/132682883/1038542.pdfIn PDF document text
    • https://wuviwozerax.weebly.com/uploads/1/3/4/2/134266003/9931248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468843/normal_604d769285b46.pdfIn PDF document text
    • https://vesumuzuvof.weebly.com/uploads/1/3/4/6/134685641/wowejim.pdfIn PDF document text
    • https://dufofumiwiz.weebly.com/uploads/1/3/5/3/135309849/mubebiwam_gomifug_wupetuvezu.pdfIn PDF document text
    • https://vifapuxup.weebly.com/uploads/1/3/4/0/134018045/2502752.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/a26d1.pdfIn PDF document text
    • https://tagelararejo.weebly.com/uploads/1/3/4/8/134846357/fezuvukanevusivu.pdfIn PDF document text
    • https://kizevopizimi.weebly.com/uploads/1/3/5/3/135351298/6189897.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/570289.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/0a09d109-8c3b-4259-9517-fcfe82a72959/does_the_2004_lexus_is300_have_a_2jz.pdfIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_32c58fb72b7247c49039cb8dd57a304a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e14ef4da-f38b-4acd-9267-d2e2060562c3/king_lear_movie_online.pdfIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_74a926703f0740e48196cc69c7baf7a4.pdf?index=trueIn PDF document text
    • https://b1394492-4877-47b1-8bf2-e962974baa99.filesusr.com/ugd/3e4b7a_41c0ae497ac447c9a478a8fa5582fc46.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/40b26a99-b762-4cc8-9948-2897155ef349/words_that_start_with_s_to_describe_someone_in_a_good_way.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f5f2eee-3c0b-4b27-b371-197d5002f939/34890088809.pdfIn PDF document text
    • https://ff102949-4c65-4b7b-925c-ea9a98d885fa.filesusr.com/ugd/7a16bb_ce3fdffbc4fd422d8be64e32129c45d0.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 4900 bytes
SHA-256: b581e3b90e36e5bfdde77e9a1b2b611ad30e247431dc9677a95fd21a63d1a9a9

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