Malicious PDF — malware analysis report

Static analysis result for SHA-256 4deb1beee130aea9…

MALICIOUS

PDF

71.4 KB Created: 2021-04-03 01:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 65395b6e148439cb19526914d0226238 SHA-1: 223272a36d4ee15055cecf95aeba16ff0b7baca1 SHA-256: 4deb1beee130aea9453ec7fbf0715301b84deb19f3e798d5a1fcf524355a3baa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a "PDF_SEO_LINK_FARM" suggesting a large number of outbound links intended to manipulate search engine rankings or distribute malicious content. One prominent URL, 'https://seumenha.ru/strik?utm_term=what+is+strategic+hr+management', appears to be a lure. ClamAV detection and ML classification strongly indicate maliciousness, likely related to phishing or malware distribution.

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://seumenha.ru/strik?utm_term=what+is+strategic+hr+management PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426822/normal_6004b542afc18.pdfIn PDF document text
    • http://sijuvibitita.iblogger.org/buddyfight_area_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462341/normal_606096157b88b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_0b50bc4ebb55425aa69b33150218512b.pdf?index=trueIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_9cd0c2c2476a4a3d83482c9c5c82a309.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/vcds_18._9.pdfIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_15d7a1d0fb5544199ddcc2d69fafd6e6.pdf?index=trueIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_8fa0955427df4649bd62fd77cf6a9e34.pdf?index=trueIn PDF document text
    • https://115777a2-cc0e-4789-9e99-30cf4bdfca1a.filesusr.com/ugd/2b3546_038dc67914b44b9fbae78a5b65904d90.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/hello_baby_monitor_user_guide.pdfIn PDF document text
    • http://nolumer.rf.gd/where_is_the_drain_on_a_whirlpool_washing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/ginnie_mae_foreclosure_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/corrugated_asbestos_cement_sheet_sizes.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/kaspersky_antivirus_online.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/52605200414.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/medicina_antroposofica.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/un_metro_cuadrado_cuantos_milimetros_cuadrados_tiene.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 5192 bytes
SHA-256: 38029b0ac3780beda9d85c4e6bfb28741353527dcf7730a823ebf8d48131619b
font_01_sfnt_off0000edc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 10224 bytes
SHA-256: 52e5d818f21443160e4347e70ef9f26e854b30222e4f9a58770085accd2208c9

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