Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84ed9a29b933b3c…

MALICIOUS

PDF

70.0 KB Created: 2021-02-26 20:47:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ecf2fc863372e49670ecd45875d27a0e SHA-1: 19cb34f5098b68b6beb7d54c5920e346402cf3e6 SHA-256: e84ed9a29b933b3cca7ca65088ce71835494ad46f3ef8b0578dba43b86bd71ae
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan payload. The embedded URLs are likely used to redirect the user to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/strik?utm_term=cisco+sg200-50p+eol PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387813/normal_6030d90bb1f17.pdfIn PDF document text
    • http://pudumalezedokav.22web.org/fawojanupolimabalekemem.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/ejCwjgQ/popazowupumagowaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380405/normal_601161894d5c5.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzekofuwe/yCJxjjB/basketball_weekend_street_basketball_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368760/normal_5ffadab7beca7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486984/normal_6025fe08cba64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374703/normal_600342d99a5ee.pdfIn PDF document text
    • https://muwujexowosis.weebly.com/uploads/1/3/1/4/131437891/folenizepeludu-romelaxesafuxur-xozivewezasu.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/mojivikapeti/74115474956.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/jamaxijekopofus.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/rakopujurete.pdfIn PDF document text
    • http://guzaxugevogifu.epizy.com/sotab.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/buku_mimpi_togel_4d_full.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/8540744395.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/visiting_card_format_png.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/what_is_the_name_of_the_blind_man_in_the_bible.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_off0000d6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 5132 bytes
SHA-256: 77b44eb9a1989ccb6b4560e83ff3c5214f730b4a20152d3363df8a13c50b0f07
font_01_sfnt_off0000e869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 10376 bytes
SHA-256: 5950a8bc1ee6460fda6ad6c9922c8f9940f19238aa5fd70b4580fa38420abe9b

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