Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf29a2d2c7681cbc…

MALICIOUS

PDF

88.8 KB Created: 2021-04-02 17:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47af0e196b15268e5f241801b69e5d45 SHA-1: 912d5e4be6ef9f36772225d4cd87567ccaea63b2 SHA-256: bf29a2d2c7681cbcebfdc1af8add6bc5e453e17b748263b3f8bd6dc99d8dccb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which are generated to appear as SEO-optimized content. The primary malicious URL identified is https://seumenha.ru/wix?keyword=spring+lane+elementary+spring+break. This technique is commonly used to direct users to phishing sites or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=spring+lane+elementary+spring+break
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/makikudi.pdf
    • https://tepukijamuboze.weebly.com/uploads/1/3/5/3/135301813/mogegogo.pdf
    • https://xanikijopido.weebly.com/uploads/1/3/4/7/134738407/af5c53d561.pdf
    • https://static.s123-cdn-static.com/uploads/4451352/normal_5ffb6dbb0cc58.pdf
    • https://lajanasana.weebly.com/uploads/1/3/4/3/134368101/8aceea6dbc436f7.pdf
    • https://garuvopu.weebly.com/uploads/1/3/1/3/131398288/c043f7b0aa4.pdf
    • https://static.s123-cdn-static.com/uploads/4412780/normal_5ff4d6d8b8961.pdf
    • https://pijafure.weebly.com/uploads/1/3/4/4/134457855/jixopipokogifovepoj.pdf
    • https://mimejomukokije.weebly.com/uploads/1/3/4/5/134510045/5dd939.pdf
    • https://xejukosaxup.weebly.com/uploads/1/3/1/4/131437924/gafirav.pdf
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/xonumufawes_medejefijif_lozadexujel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9177b9cb-4c70-42bd-a9e0-27a1bf53b67b.filesusr.com/ugd/9baf76_14eca645fd2f4c54841b06a7effe08cc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3175f404-fe7b-46d4-8869-082a90c42c7c/kafobajaneluriwekiba.pdf
    • https://uploads.strikinglycdn.com/files/aeec6a58-2d67-4631-88c6-1fb54aaf1354/bepemedujagevire.pdf
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_dc41dd4fc5f047d7b034729490580b51.pdf?index=true
    • https://uploads.strikinglycdn.com/files/052431a8-19f5-445d-a6bb-82da4a7350bc/subavemirubuloze.pdf
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_c5d0ee6adbb24755a67fb4a0773187cd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/16bdc3a5-b10d-4ded-9c4d-6f1edcf7ec85/hayward_h100id_pool_heater_manual.pdf
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_b644ca251c2245e29007646230807060.pdf?index=true
    • https://uploads.strikinglycdn.com/files/791a4f7d-6ca6-43c4-b0de-dbc1aa3f4b09/how_to_loosen_tight_elastic_pants.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011aae.bin
20ffb5070f932931c5a27d07bd6582a553c7fc34b6eff32cbbf3bb3ee76cdfa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 5548 bytes
font_01_sfnt_off00012d80.bin
915c72e0cb835de3fb04061cd78262f9cf82873cbfbfd2006385de942f934c59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D80 12264 bytes

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