Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49e4ba930a8dbc0…

MALICIOUS

PDF

74.0 KB Created: 2021-02-06 16:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1f9527b72708524d0c85f591c0fdc5d2 SHA-1: cfe0baeb3e759dd67eb5a3149044f417e1c06140 SHA-256: b49e4ba930a8dbc082ac25de957b3245e800391ab8869f81deeda923a1022e0e
164 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting an attempt to redirect users to malicious sites or download further payloads. The ClamAV detection and ML classifier also strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a lure to initiate a download or redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/123?utm_term=watch+ladybird+google+drive PDF link annotation
    • http://arenaprobet.com/71719801767gu6v0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5fd653a8089fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455890/normal_5ff9017df3813.pdfIn PDF document text
    • http://funiwigurogamu.iblogger.org/34844591559.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379048/normal_5feeb3b727532.pdfIn PDF document text
    • http://mekapetakosa.22web.org/gemma_ceramic_catalogue_2018.pdfIn PDF document text
    • http://gijofabenetawix.66ghz.com/22840058292.pdfIn PDF document text
    • https://panebafizi.weebly.com/uploads/1/3/4/3/134365464/rozaxusati_dotofe.pdfIn PDF document text
    • http://aduo5.online/broken_heart_sad_pictures6fci3.pdfIn PDF document text
    • http://healthit.space/kipodozzh4.pdfIn PDF document text
    • http://1offpark.xyz/optical_illusions_art_tutorial9fprl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408321/normal_5fce54b9c44ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367668/normal_5fcf4bbe95dc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404738/normal_5fde2f864b39b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dawutanarav.epizy.com/cyst_form_of_amoeba.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_off0000e685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE685 5340 bytes
SHA-256: f17fe2d9ae8457cdd196d69312cb1dadf99c448b70bc19dc88733d2856bc7b80
font_01_sfnt_off0000f8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 10168 bytes
SHA-256: 65c6e66c9e50ec0831d6a9242cf029b7db09fdf722445f52337b0f9f5bc1e195

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