Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ae81a2edb6a491…

MALICIOUS

PDF

81.6 KB Created: 2020-11-23 15:28:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 977aa07feba0bd1ba47488cb5ab0cc75 SHA-1: 60db15935cc0e494e02a0db5ec06771a280daf2f SHA-256: 41ae81a2edb6a491e1dc5f9586c4f326925e858ca91d1dd255a8385a1f795381
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a link farm and a call-to-action. The embedded content, though heavily obfuscated, suggests a lure related to downloading 'Kingroot v 4.0 apk'. The primary URL points to a domain associated with potentially unwanted software or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffe.ru/123?utm_term=kingroot+v+4.0+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423137/normal_5fab2b154f23b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_5fab2a9f3ec05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_5f92e51df182b.pdfIn PDF document text
    • https://litabunor.weebly.com/uploads/1/3/4/5/134522775/70cb49d7fdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410462/normal_5f94425b977f2.pdfIn PDF document text
    • https://fukituxepuronip.weebly.com/uploads/1/3/4/6/134605821/8553503.pdfIn PDF document text
    • https://getedizexagan.weebly.com/uploads/1/3/0/7/130740146/kekafuzidifulemol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379618/normal_5fb2e118e56ea.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/mijotesuwu_posine_ritebexe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482863/normal_5fa7c3b231130.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/14506711742.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/unblocked_games_cut_the_rope.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/loreretodibiladumakuja.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_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 5396 bytes
SHA-256: 913e8aaa294864329e1f4f779a8561c0c08662ebf515f5de70145604161183e2
font_01_sfnt_off0001082c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082C 16056 bytes
SHA-256: fe56f4f82475c990ac7f2a6a58ff841ea7ba5ee5b3ad5c7bd3f39075d84e38ec

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