Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92887e538ca7ddf…

MALICIOUS

PDF

89.4 KB Created: 2021-04-09 13:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8af88719441c93d02638d7739ada19b3 SHA-1: d66a218c398341d9b37923d344f56def26a5b355 SHA-256: b92887e538ca7ddf7d581bef9fbb15efe140057d703caf6d8daabebccb421f17
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' suggesting a malicious intent to redirect users. The document body, though heavily garbled, contains text related to English-Spanish translations, likely serving as a lure. The presence of multiple unknown reputation URLs and ClamAV detection strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=verbos+regulares+en+ingles+traducidos+al+espa%25C3%25B1ol
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/zexonisasozoveta.pdf
    • https://cdn-cms.f-static.net/uploads/4409619/normal_6054c154dc3f8.pdf
    • https://static.s123-cdn-static.com/uploads/4366399/normal_6007ec3f612e0.pdf
    • https://tedevonefuses.weebly.com/uploads/1/3/4/5/134528644/doxajemisubu.pdf
    • https://cdn-cms.f-static.net/uploads/4476930/normal_600b3b0c5ca5f.pdf
    • http://libidisebosuv.22web.org/77006310255.pdf
    • https://static.s123-cdn-static.com/uploads/4369775/normal_6003b26dd19ef.pdf
    • https://cdn-cms.f-static.net/uploads/4486984/normal_6019a2b0ae54f.pdf
    • https://cdn-cms.f-static.net/uploads/4383170/normal_603203eb15852.pdf
    • https://cdn-cms.f-static.net/uploads/4424645/normal_600ca5d0d3a06.pdf
    • https://kozugirufeji.weebly.com/uploads/1/3/4/8/134884007/werigol.pdf
    • http://fonabibexame.iblogger.org/44467384358.pdf
    • https://wovukevaz.weebly.com/uploads/1/3/4/5/134523328/7024083.pdf
    • https://tigekinoninufuv.weebly.com/uploads/1/3/4/6/134687643/nuzoxomasirad-butoxibog.pdf
    • http://gefejisu.22web.org/boolean_algebra_problems.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/c5832314-5059-47c8-b3a4-fb4f9b89be50/33701227089.pdf
    • http://vujoselaserib.epizy.com/dojalaweve.pdf
    • https://uploads.strikinglycdn.com/files/c9a53971-1f21-4cdc-80a6-e1927be81096/dorip.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9af.bin
a9b7f081991a9155161d3e042ba0b15cd3f175bcc33c69a68b0c1ad4b1cff4a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 5440 bytes
font_01_sfnt_off00010bf2.bin
d6307a851096baaa26d0138ad2e03474e8ee92c347836684b723717cedbc1c47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 11656 bytes
font_02_sfnt_off00013236.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13236 16204 bytes
font_03_sfnt_off00014764.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14764 4324 bytes

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