Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27394f1e3884eca…

MALICIOUS

PDF

76.3 KB Created: 2021-04-11 13:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ba50a0d57a9d22918e45ba5cefbb5be4 SHA-1: ed6f62e275279cc987556d397c77338000935491 SHA-256: e27394f1e3884ecac90826a86b22b1236e181f5a107991a3588caaaa1ab853b9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as book titles or search results, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious campaign.

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://nipisod.ru/strik?utm_term=what+is+the+best+keto+book+for+beginners PDF link annotation
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/708f8a.pdfIn PDF document text
    • http://olymptrade.buzz/5144561547l1hsl.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/gjbnQja/99218726629.pdfIn PDF document text
    • https://cdn.sqhk.co/risinibigasi/hajfgjg/uterus_cordiformis_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/fafojipedul/uA9Nojc/dream_defenders_show.pdfIn PDF document text
    • https://cdn.sqhk.co/fomezawelud/fjexR2N/72031318760.pdfIn PDF document text
    • https://xezelugewopisaw.weebly.com/uploads/1/3/5/3/135311865/vewezevut.pdfIn PDF document text
    • http://idem-peshkom.ru/litozemuihryx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zulojazivuvuk.epizy.com/tom_clancys_ghost_recon_breakpoint_ps4_gameplay.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/suffix_worksheets_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/81769076849.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/42428855323.pdfIn PDF document text
    • http://fejesaj.epizy.com/sopomepotigodilu.pdfIn PDF document text
    • https://beca70af-11ea-46d2-a649-d7fd44c468ee.filesusr.com/ugd/dd41e2_5137a3d23ea147738d0e9fe0b3e1a8ae.pdf?index=trueIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_1e9a66ce5b4e4bd694c5d03a5743d221.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusixa/24791889316.pdfIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_743d3f27cb0e49328d9ba1d7717574ac.pdf?index=trueIn 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_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 5216 bytes
SHA-256: ce6cf65c72820fd95de14418b3e80e73c9a3271ec66a09e516123753c16958e6
font_01_sfnt_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 10896 bytes
SHA-256: 325881eb3fd3035954bceb96df6faf8127c95971f6ee5c3e3e41e9d9d45ae97b

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