Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dd7b4843130918…

MALICIOUS

PDF

83.9 KB Created: 2021-03-20 22:11:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30872928c869a0f9923a8e1deb977a5d SHA-1: 7ba53206c196547e3671eadc6d5dcac8dd70ebf4 SHA-256: 63dd7b4843130918ff330ed97d930dc7dc0011a045a2e5bd40323304a42f887d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The primary URL, https://jumiwimov.ru/strik, is likely used to deliver a malicious payload or redirect to a phishing site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=who+invented+new+york+cheesecake
    • https://fumeseteno.weebly.com/uploads/1/3/1/4/131483149/zuvelibezufavujo.pdf
    • https://gorimulokubev.weebly.com/uploads/1/3/1/4/131438265/powifanovuvanu.pdf
    • http://midakurapujif.mypressonline.com/medical_definition_of_death.pdf
    • https://pitalozel.weebly.com/uploads/1/3/1/3/131384414/e4cdd8323.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_77c4056fe4ef4fd3b548528ff4b2a483.pdf?index=true
    • https://s3.amazonaws.com/jajuzasalikirut/zosesazibasakijusobidadam.pdf
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_59aaf0ae4770462f807644a2c8075c9f.pdf?index=true
    • http://mubadel.epizy.com/54323022817.pdf
    • https://s3.amazonaws.com/sepovutapakogaf/gabikoxerigajobategufatam.pdf
    • https://s3.amazonaws.com/bibejovixapis/tovubawuzaraxadalu.pdf
    • http://gidepajujida.rf.gd/product_brochure_design_template_free.pdf
    • https://s3.amazonaws.com/tumuzu/allow_internet_explorer_windows_server.pdf
    • https://s3.amazonaws.com/wazotojemov/kemivofewexaw.pdf
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_cf4b54e08f0c49799473d9d981075e9c.pdf?index=true
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_9c7e48e77912430bbf67907a4d852dee.pdf?index=true
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_d24ca6ec3594443abf29554719c85733.pdf?index=true
    • https://s3.amazonaws.com/pegozegi/funevakume.pdf
    • http://nibubatovavav.atwebpages.com/meditation_guide.pdf
    • http://jewigetujano.epizy.com/does_a_w_look_bad_on_transcript_reddit.pdf
    • https://s3.amazonaws.com/ladiwuzetawedi/aashto_pavement_design_guide_1993.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d5.bin
51618e40c50f37640375a7684b20565dba0142ee68ddfa0315ce042aa6e83006		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 4108 bytes
font_01_sfnt_off0001044d.bin
40a8e13f1c62fd5cdb8e181c694bf61ba0646054950034c8efb268635b6db7bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1044D 5328 bytes
font_02_sfnt_off00011684.bin
cba28fb0414fcb883243cb823961daa0d884ffa4f541b05641386fa1e5edf3b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11684 13512 bytes

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