Malicious PDF — malware analysis report

Static analysis result for SHA-256 653937c2636ca390…

MALICIOUS

PDF

74.3 KB Created: 2021-02-27 03:50:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2b8dd316c01c832ff3a1c08990972a37 SHA-1: 7132429aadba93f00928044e5e3d0c31041d1998 SHA-256: 653937c2636ca39026497730a788da0a78fb019cab5766f2b8b76e56c9b1ebc0
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 at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a malicious intent to manipulate search results or distribute further malicious content. While no scripts were extracted, the presence of numerous URLs and the ClamAV detection strongly suggest a phishing or malware distribution campaign.

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://crophysi.ru/wb?keyword=fire%20and%20ice%20tahoe%20price In PDF document text
    • http://italysummer.space/puff_the_magic_dragon_easy_piano_sheet_music2k83c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_601b181ee4f9a.pdfIn PDF document text
    • https://pojuzalik.weebly.com/uploads/1/3/4/2/134235388/2853966.pdfIn PDF document text
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/cda0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416125/normal_6011b8bfdb459.pdfIn PDF document text
    • http://gordei2d.com/cryptocurrency_for_dummiesdqhsy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388157/normal_5fcc454e9d70f.pdfIn PDF document text
    • http://blekrossi.ru/42998488108e1xtm.pdfIn PDF document text
    • https://cdn.sqhk.co/xolokenuw/RoxMjeS/drone_shadow_strike_cheats_android.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/dinigugaxej/wujenaresefufapas.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/drama_korea_cambrian_period_sub_indo.pdfIn PDF document text
    • http://talakukatutevib.epizy.com/17631587680.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/8856380620.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/design_evo_logo_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/57296324916.pdfIn PDF document text
    • http://mafixatoje.epizy.com/peer_influence_on_academic_performance_research_paper.pdfIn PDF document text
    • http://resifukizuve.rf.gd/69415141593.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_off0000e4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D2 4908 bytes
SHA-256: e8bfbb7a64e9ce2c9b5b0e3f737ddd844464951bb82c62db5eb0987423a178a7
font_01_sfnt_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 11368 bytes
SHA-256: 77064b714ac35533352cece126036430d6155d6a3fa89cc301f6cbb55b928c0b

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