Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9922a48932d17a5…

MALICIOUS

PDF

67.3 KB Created: 2020-12-21 02:49:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7dc37a335a4a6940b25dccd5f089ddaf SHA-1: 1e85f328d9b1a9262d14bd3a851dcb7a2e4d70c3 SHA-256: b9922a48932d17a578099bd786997dfc61ffc8db19159c7a144a03fd147a1032
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector URL. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary malicious URL identified is likely used to lure victims into downloading further malicious content or to a phishing site.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=jumping+frog+origami+pdf In PDF document text
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/6cffac12688d8b0.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/zijero.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddef24d1-3bd6-47c9-9b39-25468c87c073/72417852917.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/9158534469.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/reading_past_simple_and_past_continuous.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/25437487060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26315bf1-e0f3-47bc-b614-396ebce60c5f/cherry_chem_strain.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/33747210762.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/lupisakigeloved.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca4e3c92-24ad-4ad9-980a-666bed0d75fe/chase_field_all_you_can_eat_review.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/chatrapathi_prabhas_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/trimmers_the_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/rasota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/310e175f-a6cb-4aa4-ad3e-812742e57f66/xezoduwogez.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/epic_fail_fortnite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b641713-eb9c-4811-8b89-1da17dc67e35/79993328755.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_off0000c978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC978 5140 bytes
SHA-256: a98d8bc49430ac2960d6d9efbdd35cd163adb3d62f76e8a687c773f0690ba0f6
font_01_sfnt_off0000dae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE2 11028 bytes
SHA-256: 0872ea83374dda64579db90b140c0544c6ded5bb647be6bab86410b366b9fe70

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