Malicious PDF — malware analysis report

Static analysis result for SHA-256 04dc72a0c24b8002…

MALICIOUS

PDF

99.8 KB Created: 2021-03-24 17:08:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae0ada3b8529fea1355d0a629bcaad9f SHA-1: c937d006c4157b6b0e0108e80efefa15c6070593 SHA-256: 04dc72a0c24b8002eb89a30fdebbb4d84bb29543f13143ee45dc75ed570b50f5
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 link farm pointing to multiple PDF files, including one hosted on 'mikipifovusi.epizy.com'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/award?keyword=strategic+marketing+pdf
    • https://static.s123-cdn-static.com/uploads/4405467/normal_5ff1d11942135.pdf
    • https://cdn.sqhk.co/zozijawutuxu/g1vChbC/vosapegi.pdf
    • https://cdn.sqhk.co/pefemezized/iiDgjgh/72410372680.pdf
    • https://cdn-cms.f-static.net/uploads/4416664/normal_5fd17d7d358dc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mikipifovusi.epizy.com/60440303569.pdf
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_8d97ab1041724b24b70a9d57ddafcef9.pdf?index=true
    • https://s3.amazonaws.com/zukogi/biwomerikinexosarosu.pdf
    • http://zoxumatodemake.rf.gd/73774187770.pdf
    • https://s3.amazonaws.com/janodojivi/zapujir.pdf
    • http://sidabimesalib.epizy.com/guidelines_for_foreign_body_ingestion.pdf
    • https://s3.amazonaws.com/rilexazejuzovep/sisogapof.pdf
    • http://lufasojaweg.epizy.com/gavanuvadanez.pdf
    • https://s3.amazonaws.com/dowesitobuga/which_is_the_best_scroll_saw.pdf
    • http://soromerib.epizy.com/kokesudomuxaz.pdf
    • https://s3.amazonaws.com/pewibim/rodojefegunojixe.pdf
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_96e75c164d7d48fbbe04ad6cd0b26f66.pdf?index=true
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000153d9.bin
d7b9de495b5d8b0bbe7dd15ba20e65cadf4d512e300a5eadfa59116eb15dccbd		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x153D9 25564 bytes
font_00_sfnt_off00010171.bin
6ed886ca2d2327958524124e4ad1824f9e8d74a72e7a902d3845345f9966e943		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 7972 bytes
font_01_sfnt_off00011bf9.bin
3ef0dee0d3de112f595caa8931d9dae9c0b558f3bbdc58c7dbdb287200570140		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF9 5432 bytes
font_02_sfnt_off00012e65.bin
317d5500792ebc3a5f459cfe02eafa7d4d967d45854b51eb9c407d635c87fd4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E65 10932 bytes

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