Malicious PDF — malware analysis report

Static analysis result for SHA-256 192ccdd778d9de7a…

MALICIOUS

PDF

65.9 KB Created: 2021-03-24 16:56:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88fe990ed6d4e7cad4275e3a6e0d30de SHA-1: 9c30603735227d47df0a5d76101456a4ca6c0a82 SHA-256: 192ccdd778d9de7a81572d588674ffec58631ccdab106f4b9b20123ee75c5e55
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with several pointing to unknown or potentially malicious domains, indicating a link farm or redirection strategy. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to external resources.

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://dafemum.ru/wix?keyword=chapter+17+test+answers
    • https://nimafomu.weebly.com/uploads/1/3/2/7/132710507/2087339.pdf
    • http://difavusimope.iblogger.org/informatica_rio_do_sul.pdf
    • https://ziziwatir.weebly.com/uploads/1/3/4/7/134713039/1871596.pdf
    • http://bet-info.ru/tracfone_lg_premier_pro_plus_32gbe5v3s.pdf
    • http://wavikedinufefe.iblogger.org/joxopagefirorawezak.pdf
    • http://therarbooks.com/50142922434m9tti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/benubapopikaj/lego_marvel_super_heroes_android_data.pdf
    • https://s3.amazonaws.com/vuforewebub/28184006653.pdf
    • https://uploads.strikinglycdn.com/files/f1c0af14-17ce-4129-b57f-ca6ea4531508/why_landscape_photography.pdf
    • http://bobesesoja.epizy.com/gegedomorilonufapimawaxe.pdf
    • https://uploads.strikinglycdn.com/files/84f5e941-81df-401a-8ba5-20bf92dec90a/26838265689.pdf
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_334c76deee4442b296e12c61071cb166.pdf?index=true
    • https://s3.amazonaws.com/wekibik/xunuvimilupidatipemelog.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/the_martian_chronicles_book_summary.pdf
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_158dd33829404a0b8a7b4a0bd4109e9e.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5af.bin
5f15a858ec7b5808c25ae1bf1aaab22ab2b0b1ecbcf78390e885571dd5c81568
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AF 5004 bytes
font_01_sfnt_off0000d6c5.bin
a4029c39867f8960d67785462580a3b1317c424cd727447f3ef22b0c67fa4089
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 10732 bytes