Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f23e05e67dbdded…

MALICIOUS

PDF

119.1 KB Created: 2021-05-24 19:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b881d733908d00257df47437643dfa10 SHA-1: aa18dc43e218788f8bbc85c18454d28b6fe47d9a SHA-256: 8f23e05e67dbdded3c223f2eb57b7e05d4e7033cbb20bccfe24587d32a3a794e
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 0.9998

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.
  • 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://botokaw.ru/strik?utm_term=st+thomas+aquinas+summa+theologica+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490519/normal_6061da75dca9d.pdfIn PDF document text
    • https://jofuzidud.weebly.com/uploads/1/3/4/8/134868871/3871167.pdfIn PDF document text
    • https://suletakawuzumab.weebly.com/uploads/1/3/5/3/135348492/gaximobozama_fomubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_6010099050bc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_603c75a2239a0.pdfIn PDF document text
    • https://tivirubopif.weebly.com/uploads/1/3/1/4/131406506/1139122.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/8919458.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374177/normal_5ffdfaf757e4a.pdfIn PDF document text
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/xusokomuk_waruvegekoxovus_faduluruzu_rezire.pdfIn PDF document text
    • https://kafunuxuvivupar.weebly.com/uploads/1/3/5/3/135303333/sujufanetoluj.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://s3.amazonaws.com/genedesowul/gigizexafoporitedisixe.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/sivakagaxizawedizemolek.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/sony_str_dh500_protect_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/church_administration_and_management.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/free_letterhead_template_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/inquiry_journal_world_history_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/80777402274.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_off00018358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18358 5584 bytes
SHA-256: 087d8c647e5e6c23a313c2091167e188175d35d2cbfcf5dad76589205f0da899
font_01_sfnt_off00019625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19625 12608 bytes
SHA-256: 3a080bafc3c01fe135650aaa4bf3c7bd958e7c8f065f83c334a121a1f6e93d23
font_02_sfnt_off0001bf0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF0F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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