Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa5c4c408beae87…

MALICIOUS

PDF

78.4 KB Created: 2021-05-16 03:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 58592ba9e5baf4ce66b161247cf36e56 SHA-1: 4668b6b2e16138ddc05418068a398049dfdade9d SHA-256: 4aa5c4c408beae875e30b9527ba62853f4efe7f6f99fdaca0f81597b2edb70e5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or SEO spam document. It contains a large number of external links, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious or unwanted content. The presence of embedded URLs and the overall structure strongly indicate a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=shark+vacuum+net+worth PDF link annotation
    • https://cdn.sqhk.co/mixubiki/RheGcgc/22506193812.pdfIn PDF document text
    • https://cdn.sqhk.co/tifisizeliz/hcshigi/22347974319.pdfIn PDF document text
    • http://sinoxaju.mygamesonline.org/30412830351.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/QgdbfbB/kiwaguk.pdfIn PDF document text
    • https://cdn.sqhk.co/kutogudofi/fMHgcPY/horizon_credit_union_membership.pdfIn PDF document text
    • http://xasekijig.mypressonline.com/dokikukapepubawoluxoz.pdfIn PDF document text
    • https://cdn.sqhk.co/rorexamuviz/56chfUt/zutalenoxaxebavoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_84b376eb929144fdbebb022489ff461f.pdf?index=trueIn PDF document text
    • http://baxudoxubalafe.epizy.com/tuxolanotikukif.pdfIn PDF document text
    • https://db6a684c-bd73-4a61-997a-17040cc1d896.filesusr.com/ugd/bbbb20_5153bf55571e4ecfa14a69779989531e.pdf?index=trueIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_379a2176a6394028991a04ce035acd9d.pdf?index=trueIn PDF document text
    • https://6552665f-f3ce-4070-9f47-7b493df4570a.filesusr.com/ugd/3d88c7_e2350a4ed5b54660add393239b7b0be4.pdf?index=trueIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_ff1529f309ea46bd9267fe304ebf19d9.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_e740b1a97059404e8142746659d7b8a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae949eae-d56d-4f26-8ffc-8de8351d680c/38221565789.pdfIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_e463a5c53529466e8ab709000210658f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63085fb6-e863-4bfc-bd95-5497c19c49e5/how_to_apply_igora_hair_color.pdfIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_304fa6d5e4174deeab6d7bf4c88feec8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f91f97f4-0b8f-4f2d-aa24-3dd3aa13bf55/31377403551.pdfIn PDF document text
    • http://raxajabidadida.onlinewebshop.net/springer_books_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ee1cffd-8934-429d-82af-93d942c3a386/how_to_draw_a_face_with_charcoal_for_beginners.pdfIn PDF document text
    • http://kipamorilezux.epizy.com/kevogunelap.pdfIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_93423993f29a4556997b277f521d2fe8.pdf?index=trueIn PDF document text
    • http://povalimokuwov.rf.gd/zilejipavom.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_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 5148 bytes
SHA-256: a138500b4f66770229e3a9a1568bf00c0e795b6d4fe777d840ecf58abfbcf207
font_01_sfnt_off000103e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 11440 bytes
SHA-256: 30a65012fbe368c8c0276e69c8166df847187040619803509fb5d61aab5e774e

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