Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8dd63634072670…

MALICIOUS

PDF

74.5 KB Created: 2021-02-20 18:58:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b1efacfcbc18ca5e5090a055279e1e8f SHA-1: 28c00adf47bdf8f9d39e309bd768fd9d33192333 SHA-256: 4d8dd636340726702e3ee2092bcd60ac903dc9085941fd732ccbd68d3431dc56
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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.
  • 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://bologen.ru/strik?utm_term=hermosas+criaturas+libro+2+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445754/normal_5ffdc51b83af7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479917/normal_601da84ee1575.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/seputefeter.pdfIn PDF document text
    • https://xaziribubeka.weebly.com/uploads/1/3/4/3/134397614/a94942b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476580/normal_5ffecef97aa9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491169/normal_600c0a4b1ca2a.pdfIn PDF document text
    • https://lekozeva.weebly.com/uploads/1/3/5/9/135964777/pisigemog.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/kitakilesa/gizokuminobitojik.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/luxomuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/54775657196.pdfIn PDF document text
    • http://dikewovob.epizy.com/96889786458.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/44932439078.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/lofudibevevul.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/here_i_go_again_drum_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/tamasha_marathi_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/fallout_4_railroad_quest_guide.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_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 5532 bytes
SHA-256: 323936fc7c4e0df3d9ce7e7589b14573b15f7f5dd517d4f9ec63117c095855ba
font_01_sfnt_off0000f6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F2 11344 bytes
SHA-256: c6a6cb3f90da744e1f77dfedd50b9026130d94723ac4360597628c284abe53e0

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