Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce2113b20761cf7…

MALICIOUS

PDF

84.7 KB Created: 2021-05-13 09:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b840c3aef16593ead3fdb4f85ddf9a46 SHA-1: 737fe22504cdbd8f82472b5361a0006a2f623c3d SHA-256: dce2113b20761cf7fe83c9a1bb316aa6ea360b0f8d6ad08c831be862d1719789
186 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 6

  • 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
  • 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://soxebez.ru/strik?utm_term=effective+teaching+strategies+that+accommodate+diverse+learners+in+nursing PDF link annotation
    • https://sipovabamekejo.weebly.com/uploads/1/3/5/3/135391609/dififup_wuresofizemefer.pdfIn PDF document text
    • https://wukavuzadit.weebly.com/uploads/1/3/0/7/130776823/xemigo_dedalafuzurefek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462379/normal_5fea2c2a43638.pdfIn PDF document text
    • https://kisetizep.weebly.com/uploads/1/3/5/9/135992433/5994736.pdfIn PDF document text
    • http://expo-kit.ru/70855123835mg1sj.pdfIn PDF document text
    • http://sreda.city/remozezalasunufigokanruuj.pdfIn PDF document text
    • http://opt15.ru/2000_buick_century_repair_manualfgx7k.pdfIn PDF document text
    • http://prizinsta365.site/cant_help_falling_in_love_chords_ukulele_tabsgk9ui.pdfIn PDF document text
    • https://finenomasawovep.weebly.com/uploads/1/3/1/4/131437785/puzatamiginufesirizi.pdfIn PDF document text
    • https://tisexazom.weebly.com/uploads/1/3/2/6/132682329/3b74f6ba72b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444377/normal_5fefdd715bf03.pdfIn PDF document text
    • https://radumudoxelis.weebly.com/uploads/1/3/4/2/134235428/4774467.pdfIn PDF document text
    • https://sukizasatesez.weebly.com/uploads/1/3/4/6/134686833/lelili.pdfIn PDF document text
    • http://finansi-7.online/how_to_program_element_tv_with_universal_remoteinuaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_818ee1e99af54a51b939cbcb89dc6249.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_594c4044c72c4de3a1b5ad26a9d50bef.pdf?index=trueIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_aed17bd86ce24529bc9bb97f4df96173.pdf?index=trueIn PDF document text
    • https://b56e6f12-3f4b-4b75-bc29-9585eb3fba71.filesusr.com/ugd/73f0dd_6372ee8fb14f490f902e1a5ea34da14b.pdf?index=trueIn PDF document text
    • https://d321836a-1bf8-47c4-b4d3-67fe1e7f0250.filesusr.com/ugd/33ab24_0b622e0cd1144598b9e0eebcb8243f83.pdf?index=trueIn PDF document text
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_5ed2a37585444d038cf6bbf921a5397b.pdf?index=trueIn 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_off0001079d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 5452 bytes
SHA-256: 1a1921a6127d32256925b10c8e0df2f2fcfc2ddda4b3efbdf8798d1fc6485c74
font_01_sfnt_off00011a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0E 12060 bytes
SHA-256: fa3d97eeb3d85ee394b02348ef18ebfa767a7f13d0065b3d01bd77e93d8808e2

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