Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9f477904a67872…

MALICIOUS

PDF

92.0 KB Created: 2021-04-09 00:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 49b9aa47b4402dc5c34cc4b61debd583 SHA-1: 47ff4046b9bf99a25f9df6e9a0285143341f0542 SHA-256: dd9f477904a678725558a103a71f4a32122bcc444f7bf0697c27622a0d347f46
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM'. While the document body is heavily obfuscated, the presence of numerous external URLs suggests a malicious intent, possibly to distribute further malware or engage in phishing. The ClamAV detection and ML classifier also strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=how+much+does+a+private+caregiver+make PDF link annotation
    • https://cdn.sqhk.co/libibajuzumu/idtZ6id/breaking_into_wall_street_400.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388041/normal_5ffa22acacea7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424666/normal_6013856f29089.pdfIn PDF document text
    • https://fepobewute.weebly.com/uploads/1/3/5/3/135386667/jomutiwuwudito-liruzutuv-nupuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477139/normal_6011725da26ee.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/bKLwhjI/50690983750.pdfIn PDF document text
    • https://cdn.sqhk.co/fetedudi/4Dhehdh/78664614918.pdfIn PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/lugexebuz_pepipakuzovom_pozokenarumedi_xujulep.pdfIn PDF document text
    • https://cdn.sqhk.co/tememagitapo/dhhjhib/best_piano_keyboard_for_beginners_88_keys.pdfIn PDF document text
    • https://negogepif.weebly.com/uploads/1/3/0/7/130775604/taxej-fopusatabijop-nimone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/resisuna/nimoworazuwovigitowir.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/how_to_use_fusible_interfacing_for_face_mask.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/6455341988.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/96611679438.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/44444797739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e991dac-20dc-4df0-97bb-0f978a688103/wd_my_cloud_mirror_passwort_vergessen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6479f411-5758-4a60-8114-dece03ede091/13023478673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22d1f08-7372-4bf5-8578-054ea396a76a/maxapikafepikuvujilolos.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/bizabazuzireves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22971347-7646-4b83-ba0a-632af5cb58ad/wikegog.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/62047704060.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/almost_home_mercyme_sheet_music.pdfIn PDF document text
    • https://medlineplus.gov/caregivers.htmlIn 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_off00012b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B44 5632 bytes
SHA-256: 81d610f38789f1851b4d978c79823833de34d3a77a2145156fdd1d9d94ea6f6a
font_01_sfnt_off00013e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E55 10648 bytes
SHA-256: 77c7474b55e7696b935fbe5d9b92c49fd5eedac51765d08999b7e1162b9fa9ea

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