Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d635456e419b40…

MALICIOUS

PDF

76.1 KB Created: 2021-04-05 00:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7371bb46a3f244164ecf100ad47b0d81 SHA-1: d45d19b1b8b326c271db4fdd806cefe50824b390 SHA-256: c2d635456e419b4041267a5c7bb5588e3126281199f0cca3769dc8bd769696ca
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm designed for SEO manipulation. The ML classifier also assigned a very high probability of maliciousness. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites, likely as part of a broader campaign to distribute malware or compromise user credentials.

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://yafferge.ru/wix?keyword=get+on+top+2+unblocked+66 In PDF document text
    • https://rimofemosi.weebly.com/uploads/1/3/4/3/134351632/9744159.pdfIn PDF document text
    • http://tuforuj.mypressonline.com/standard_dimensions_of_building_components.pdfIn PDF document text
    • http://mifvideo.space/how_to_do_time_management_in_examlk2eb.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/26848809028.pdfIn PDF document text
    • https://sopunarexij.weebly.com/uploads/1/3/1/8/131857112/nuwuxuparudaxoz.pdfIn PDF document text
    • https://ninijaliwejito.weebly.com/uploads/1/3/4/3/134350726/6173240.pdfIn PDF document text
    • http://bestunew.xyz/puzezagupiligigarbino.pdfIn PDF document text
    • http://imedo.ru/1266392181ab8wb.pdfIn PDF document text
    • https://nirejabepifu.weebly.com/uploads/1/3/4/2/134266024/b23ab48ae3.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/mufukep/zodobapotobumuzudezosero.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/commander_deck_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/nodejufo.pdfIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_57e03bf5c498460a8d6d1fa4d4e8236d.pdf?index=trueIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_e41a8e9218f54f8f80bff440caa8abf1.pdf?index=trueIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_73e47be5ea49404385b4615ec35ce4ed.pdf?index=trueIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_c833ee2c7c51470c996bc19cc6557e0d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/61095545963.pdfIn PDF document text
    • https://87d5e434-dc39-4d64-8681-877d64e204d5.filesusr.com/ugd/5660ac_4d5af63e67494f6a9199c8d529f5aa6f.pdf?index=trueIn 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_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 5104 bytes
SHA-256: 82a9908c2521dd7289d81f8aace2ec2758de0810199076d5f452f7dbef0dbdf0
font_01_sfnt_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 10752 bytes
SHA-256: 58acbf6e4078d21a73d3dd6cc33244bf65a02a0169dffcbda733ec47e056d021

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