Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f40552d736f129…

MALICIOUS

PDF

74.7 KB Created: 2021-03-25 02:03:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 458c952e51e3387af711dd5fdd2d9186 SHA-1: c90e13c9a627fbc437d14c779cd7019a2f2b1f43 SHA-256: 64f40552d736f129900e3b783f8769c169e9745545042b759923b34d5fd5e3a2
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a 'PDF_SEO_LINK_FARM' which indicates a large number of external links, with one pointing to 'https://nipisod.ru/strik?utm_term=who+is+higher+than+a+sheriff'. This suggests an attempt to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

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
  • 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://nipisod.ru/strik?utm_term=who+is+higher+than+a+sheriff PDF link annotation
    • https://lavozeto.weebly.com/uploads/1/3/0/7/130775819/bekadezuzaneg-dataje-vigaginubilivol.pdfIn PDF document text
    • https://mojivuza.weebly.com/uploads/1/3/0/7/130775228/sewozaxupu_kowasogerale.pdfIn PDF document text
    • https://pepakulal.weebly.com/uploads/1/3/4/8/134885681/e089565c7ae.pdfIn PDF document text
    • https://sojurepew.weebly.com/uploads/1/3/5/9/135992925/1404496.pdfIn PDF document text
    • https://rijevolokawuja.weebly.com/uploads/1/3/4/6/134661742/badeboletuwus_foniw_puneba_ximuba.pdfIn PDF document text
    • https://nanopimage.weebly.com/uploads/1/3/1/3/131398258/matokubijonif-firakosax.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/mikibetiv/90384185471.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/fallout_new_california_special_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/23090380959.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/what_is_price_of_smart_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8772a95-e314-4636-930d-cf638dc091a5/art_pro_mpa_ii.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/zutizudopam.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/wixililu.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/16194288785.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/93496696353.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/custom_wheels_fitment_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c933a4a-be34-45ea-bffd-f96fea4bb06b/wefoxala.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_off0000e6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 5012 bytes
SHA-256: 48a269a8e080937421eec5231785ac1170c7746c3640e19b230ebf84065eae24
font_01_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 11060 bytes
SHA-256: 1f453054a5aae343ac3c9faedf8b9e7288ade844ee3881dbb5ca1a4b353ce17f

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