Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb8a1bbbe4894a2…

MALICIOUS

PDF

66.5 KB Created: 2021-02-21 04:18:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4525031ce655d58fa9433901efe1de1e SHA-1: 501517730b96c0f3c1fd08e54c842f97c7f99dab SHA-256: 2bb8a1bbbe4894a2134736a74a4bba73429f12290cccc0d81dbefa0ff5ccd7a2
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically mentioning 'crophysi.ru'. Additionally, another critical heuristic identifies a PDF link farm with numerous external PDF links, including 'digitaltoolsfor.xyz'. The ML classifier also strongly flagged this PDF as malicious. These findings indicate the document is designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

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/wix?keyword=power+supply+calculator+evga In PDF document text
    • http://digitaltoolsfor.xyz/jisenig26fuy.pdfIn PDF document text
    • http://stankoff.org/crysis_warhead_free_full_version_pcvjsiv.pdfIn PDF document text
    • http://mini-cam-v2.club/8725331152097rfs.pdfIn PDF document text
    • http://prodit.space/nunawifitaropigaiyz62.pdfIn PDF document text
    • http://copytoshka.ru/2104307190cii09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375088/normal_5fe54339870ef.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/63271c1e6.pdfIn PDF document text
    • http://f1l3download.site/pesuvanejidogs4ivm.pdfIn PDF document text
    • http://registrat.space/into_the_wild_epigraph_meaningsa6syt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481825/normal_5fd14b8f8b377.pdfIn PDF document text
    • http://smilex.club/golf_clash_wind_chart5jpe4.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/tetenifeme/how_to_put_code_in_clarion_radio.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/55921136200.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/43716773226.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/rizuwijosumedagozir.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_off0000c54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54A 5356 bytes
SHA-256: d2e7fce2f6f53503b186f2ff832120c28e055f864a6b82abf27590435dc49988
font_01_sfnt_off0000d7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B4 10976 bytes
SHA-256: a5252fe34de4a03f5ac34e2b96b9541d7c478fa8dba087cdc21b29c6cbce2a0d

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