Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8efa541be145a7…

MALICIOUS

PDF

75.4 KB Created: 2021-05-24 06:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43e6e41a5c3acdd4b7c8b59e637dfd38 SHA-1: b619c326bd25b6aa51036c52debaf7c4ccd59940 SHA-256: cc8efa541be145a7d6a3edf7db766ba1be490428df7b9dc8d3d3fcb94a718205
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, contains keywords related to "replacement parts for brother knitting machine" and application metadata, which are likely used as lures to disguise the malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cdn-cms.f-static.net/uploads/4467586/normal_6031e35b25145.pdf
    • https://cdn-cms.f-static.net/uploads/4496602/normal_5fd31dfac33a8.pdf
    • https://bolefusugo.weebly.com/uploads/1/3/4/8/134868203/pavixofojabefaxisas.pdf
    • https://cdn-cms.f-static.net/uploads/4378853/normal_60603bfe2bc87.pdf
    • https://tatidadimu.weebly.com/uploads/1/3/5/3/135383915/xugubabogadajuz_tijipumafuz.pdf
    • https://zijoganidilo.weebly.com/uploads/1/3/1/8/131856317/nukeregisiso.pdf
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/2972280.pdf
    • https://gewipilozu.weebly.com/uploads/1/3/0/7/130775211/danituko.pdf
    • https://cdn-cms.f-static.net/uploads/4463810/normal_6019ba00212e4.pdf
    • https://cdn-cms.f-static.net/uploads/4402964/normal_606e9910592b8.pdf
    • https://kinijanara.weebly.com/uploads/1/3/4/5/134585029/sasaz-kesisok-pixoz.pdf
    • https://nakotibuvifotog.weebly.com/uploads/1/3/4/6/134619478/vizirow-dozidatoku.pdf
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/b714d0.pdf
    • https://cdn-cms.f-static.net/uploads/4366980/normal_605bbd7bee00f.pdf
    • https://pupowoxixibigi.weebly.com/uploads/1/3/1/4/131438439/9c9bee24a2.pdf
    • https://static.s123-cdn-static.com/uploads/4379229/normal_5ff163b01f89f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/4NO0L8wlyOA/wb?keyword=replacement%20parts%20for%20brother%20knitting%20machine
    • https://s3.amazonaws.com/woneketelak/polarity_of_dichloromethane_and_chloroform.pdf
    • https://s3.amazonaws.com/pewebopufupe/high_school_diploma_certificate_template.pdf
    • https://s3.amazonaws.com/fajixe/old_chattakkari_songs.pdf
    • https://s3.amazonaws.com/mupukesunobaga/pubivoparenito.pdf
    • https://s3.amazonaws.com/xifabilejilab/74494720428.pdf
    • https://s3.amazonaws.com/rilexazejuzovep/falciform_ligament_of_the_liver_location.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b3.bin
06f0368a987dcbb7382b7225d3de49a1c0d6494a1ea1e90eaaa674f70b9a15ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B3 5640 bytes
font_01_sfnt_off0000f9b9.bin
7bc1a3ad5325afa39077696c9382f001f8a94429eb39e460cc2bac914b1fa4d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B9 11548 bytes

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