Malicious PDF — malware analysis report

Static analysis result for SHA-256 925be4089ce5d485…

MALICIOUS

PDF

86.5 KB Created: 2021-03-19 22:48:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 032ab2ae93aefd55f124696407a780d3 SHA-1: be3b0b6f5afe07fe5f1746834674178665f65e6b SHA-256: 925be4089ce5d485b38fec964479ced34a56999c68c40246cada90a2d830e44c
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9995

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/strik?utm_term=what+are+three+examples+of+personification+in+romeo%2527s+final+speech PDF link annotation
    • https://zasefupaboz.weebly.com/uploads/1/3/2/3/132302972/feaf405e.pdfIn PDF document text
    • http://vobalemujumojak.mywebcommunity.org/nigerian_worship_songs_lyrics.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/why_is_my_lawnmower_backfiring.pdfIn PDF document text
    • http://wirobigi.medianewsonline.com/27927095100.pdfIn PDF document text
    • http://xamawigokoke.mygamesonline.org/the_accidental_prime_minister_book_in_hindi_download.pdfIn PDF document text
    • https://risenezapaf.weebly.com/uploads/1/3/4/4/134481661/47a58c8192.pdfIn PDF document text
    • https://gaburidukir.weebly.com/uploads/1/3/4/4/134463400/5112766.pdfIn PDF document text
    • https://sigogaxeba.weebly.com/uploads/1/3/4/6/134620414/nivubolozekagig_tanewele.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_97cf9988857d435f98e6fd4a70d65fc0.pdf?index=trueIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_8c6039e5f1b24e72a598a4a1971b6a2a.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_4c24110d14304bdd8e6b4170e0a3aef5.pdf?index=trueIn PDF document text
    • https://f7b0ef4b-317e-4f07-901b-4de91a029b50.filesusr.com/ugd/50f142_e37dc7521d5d49cd8d3e857cb071e352.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_1b4a5339dbdd4ae294b99c3011d76ff2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb88a9fa-8ec5-45c0-a4d2-b0bb6e71bfd6/desaninivofobipogojewus.pdfIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_92aaa454280d4f0ab744800a37cafb71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d08497e-fcd6-4f39-8c43-8e32cc57a146/norton_shakespeare_comedies.pdfIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_d47bd6889e0448519bf788904b50b00e.pdf?index=trueIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_ee21e3a6ce5346089403998882f3377f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97ed8204-8127-4c56-8870-f2982021b019/metodologia_de_la_investigacion_cientifica_diapositivas.pdfIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_c73e7efc1607402285bee52dd6adec4f.pdf?index=trueIn PDF document text
    • https://1794ee33-230d-455b-98b1-84d48067edce.filesusr.com/ugd/551769_21d9d0c0b3a04cb184c2c864fc22f661.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/047a43cb-afe3-4311-82da-3581c273b89a/33952622130.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 5156 bytes
SHA-256: 9b0ebd955b393db95496e39f476cd47213aa71246a72d53b49decad17005e255
font_01_sfnt_off00011929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11929 10600 bytes
SHA-256: 8ea506eba1b5e7eccd65fac48381f4ef3181dab62fd6416cb8ebcfae6cf77c55
font_02_sfnt_off00013d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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