Malicious PDF — malware analysis report

Static analysis result for SHA-256 262297bfefa172af…

MALICIOUS

PDF

71.3 KB Created: 2020-11-28 03:47:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87bc90f239ecfd5216c4187f9b32d5b4 SHA-1: d447038417cf04dcf2ab5d0ab19c2760e2b93ea8 SHA-256: 262297bfefa172aff3372e584d4d6098264e86d8586eb54de7cf79f40a32ac22
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the extensive use of malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=enameling+steel+sheet
    • https://cdn-cms.f-static.net/uploads/4413697/normal_5f97701cafcb6.pdf
    • https://cdn-cms.f-static.net/uploads/4452862/normal_5fae7828a84a8.pdf
    • https://bosebozix.weebly.com/uploads/1/3/4/6/134601905/d566ff757270a4.pdf
    • https://cdn-cms.f-static.net/uploads/4391954/normal_5f9db8a54a8a7.pdf
    • https://cdn-cms.f-static.net/uploads/4392871/normal_5f9bba2b28cf1.pdf
    • https://kexinebig.weebly.com/uploads/1/3/4/3/134338338/vumufoduwikuzolugowo.pdf
    • https://cdn-cms.f-static.net/uploads/4421199/normal_5fa788608725b.pdf
    • https://cdn-cms.f-static.net/uploads/4488090/normal_5fa9185d34de4.pdf
    • https://cdn-cms.f-static.net/uploads/4482648/normal_5fae1d538f833.pdf
    • https://damoleruli.weebly.com/uploads/1/3/0/7/130776580/katavovenulijupipij.pdf
    • https://cdn-cms.f-static.net/uploads/4369928/normal_5f8af46c7ba6b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://s3.amazonaws.com/tutapaxi/formasi_cpns_bengkulu_tengah_2018.pdf
    • https://s3.amazonaws.com/tokafanawa/zobadiwapidapixogig.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce48.bin
f91605cf333f444866f6c647cdc9bb625cbb3a95af33c533f683ae57fa7bb4db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE48 4960 bytes
font_01_sfnt_off0000df06.bin
318979280073a0d67bfd70006612fbade0cbc1ed895b683601775d7b493401a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 10144 bytes
font_02_sfnt_off000101f3.bin
f9c7a17474484b62a1c3de1f0f6d8d3125451ce4e770486139706d2f2ef4a025		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 3876 bytes

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