Malicious PDF — malware analysis report

Static analysis result for SHA-256 561422b0cfc92ba4…

MALICIOUS

PDF

102.6 KB Created: 2021-04-04 09:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3fb323e7e408eba755b187806fddb4b3 SHA-1: 0564b106dfa1892b7c21d70d8b5e77b42495e36c SHA-256: 561422b0cfc92ba412a43f03375c175ae9c101dff3a9498bd5f49dcd61d686c1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical detection for a link farm and ML classification indicating maliciousness. It contains numerous external links, with one pointing to 'https://jumiwimov.ru/123?utm_term=q+c+ka+full+form', suggesting a phishing or SEO spam campaign. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://jumiwimov.ru/123?utm_term=q+c+ka+full+form PDF link annotation
    • https://lomimasexoguxi.weebly.com/uploads/1/3/4/7/134736135/sigosaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423732/normal_604e87792e0a7.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/335f78bc37c78.pdfIn PDF document text
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/razikilewupo.pdfIn PDF document text
    • https://neranutedaxujaw.weebly.com/uploads/1/3/1/4/131407849/juzija.pdfIn PDF document text
    • https://fejovixojik.weebly.com/uploads/1/3/4/3/134333762/rerunepisupo-fezefovemoviri-nurapegowe.pdfIn PDF document text
    • https://xexumure.weebly.com/uploads/1/3/4/8/134885566/kigurelo.pdfIn PDF document text
    • https://legovizadedugid.weebly.com/uploads/1/3/1/8/131856283/1cccb5510694d27.pdfIn PDF document text
    • https://fogufufizanalu.weebly.com/uploads/1/3/0/8/130813948/8c874344c.pdfIn PDF document text
    • https://bopevifobomamak.weebly.com/uploads/1/3/0/8/130814579/05e4713a14cac29.pdfIn PDF document text
    • https://nogeduju.weebly.com/uploads/1/3/1/3/131398368/lanepos.pdfIn PDF document text
    • https://ruvavebi.weebly.com/uploads/1/3/5/4/135401399/7370530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383571/normal_605d7c6143119.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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/vifusupegiza/42637420946.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/42914456543.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/current_sudden_cardiac_death_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/rukewob.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/37594865521.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/where_can_i_watch_colbert_report_online.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/vizio_sound_bar_2._1_36_manual.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00015a75.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15A75 16820 bytes
SHA-256: ee38f326e4de8ed04c66b76479ab77cf33173de6d23beec8269a2b6ed1f2dc12
font_00_sfnt_off00010c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1D 4504 bytes
SHA-256: 5985d7712917baf32daebec76cc8348c5ac35d1d315332357398714ce8baf18f
font_01_sfnt_off00011b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B63 3720 bytes
SHA-256: a7c194c348f4bc26aad06ae1fa1eadf76503a3aca856ff80314c3d87a816eea9
font_02_sfnt_off000126c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C3 11024 bytes
SHA-256: 7daad3e64ca0ac5345e5236341ecad9b085e9fd63099bc376fcc1f9ab656b942
font_03_sfnt_off00014c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C74 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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