Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66bb61967f08ca4…

MALICIOUS

PDF

69.7 KB Created: 2021-02-23 19:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8175c4a72806d5b71fc4810055e64f38 SHA-1: 3d6c9086daad271042418f10fca5df258e7f85ef SHA-256: c66bb61967f08ca4b4962c29474db9501acd33b8a86b954547bbee3c8144dcb3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, and the presence of 'PDF_Phishing.Trojan' from ClamAV strongly suggests malicious intent. The document body, though obfuscated, appears to be related to the search term 'Prozac nation pdf', likely a lure to drive traffic to malicious sites.

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://crophysi.ru/wix?keyword=prozac+nation+pdf PDF link annotation
    • https://mebiwabubeneven.weebly.com/uploads/1/3/1/8/131871414/7243407.pdfIn PDF document text
    • http://giocodigital.website/47402381019smkxd.pdfIn PDF document text
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/4856337.pdfIn PDF document text
    • http://mmamba.ru/what_is_negative_interest_rate_meanxsoa4.pdfIn PDF document text
    • http://raisinshq.club/backup_to_gmail_for_androidhqj3s.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/zetowuzezavomiripivuvaocp4p.pdfIn PDF document text
    • https://kovuvewu.weebly.com/uploads/1/3/2/6/132695697/34066.pdfIn PDF document text
    • http://salet.store/48729322057ces97.pdfIn PDF document text
    • http://jimupitakonumi.iblogger.org/rudekilireruritojukotija.pdfIn PDF document text
    • https://guduzuzej.weebly.com/uploads/1/3/1/6/131606672/f9ff67.pdfIn PDF document text
    • http://docita.fun/69347444143djc9l.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/kelukakeb/rujolajelamewo.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/chillane_22_female_kottayam_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/bbc_sounds_apk_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/gumapudosexavi.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_off0000d460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 4988 bytes
SHA-256: a137ffefdbbf2bc5634ace999239f66bbba3ebc0be2ba704bfdbf66170cd783b
font_01_sfnt_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 10672 bytes
SHA-256: 2edfade8ae91996226d33fc0d8779b2f266df08b527741c9bfa724cdd72cb4e2

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