Malicious PDF — malware analysis report

Static analysis result for SHA-256 48280024fb3d90dc…

MALICIOUS

PDF

72.6 KB Created: 2021-02-15 16:56:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7d85b5d43e55ad4ffdaf36bdca4d8c99 SHA-1: ed83083f9a9228bd2d711ec2d191657f6756daba SHA-256: 48280024fb3d90dc7c3bb6bebf13d35265b172e7eac9cb79d67ea62d49094bfd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as a phishing/trojan. The ML classifier also strongly indicated maliciousness. The presence of external URIs and the link farm heuristic suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/aws?utm_term=drucker+managing+oneself+hbr+pdf PDF link annotation
    • https://bisitewo.weebly.com/uploads/1/3/4/4/134496646/1768505.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456999/normal_60093632d7557.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413590/normal_6004e748ed483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491969/normal_6027081c35b35.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/gidji4m/remove_zero_vector_matlab.pdfIn PDF document text
    • http://tuzazigigub.iblogger.org/washing_stained_white_sheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420907/normal_5fd653ec64280.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/RjhSWNq/27770603220.pdfIn PDF document text
    • https://dowidevegep.weebly.com/uploads/1/3/1/4/131406741/9732546.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470535/normal_5feee63bce00e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393755/normal_5fc5a156df7a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dipulitexaxuz.epizy.com/mujiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/31614515261.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/corruption_of_champions_level_up_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/free_benchmark_tool.pdfIn PDF document text
    • http://derekage.epizy.com/abc_in_sign_language.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_off0000ded4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED4 5772 bytes
SHA-256: 512d96ae2cc63e9eb9f8ee49bf8935174ad8e0402aedda8afe11a37ff263d48e
font_01_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 10504 bytes
SHA-256: c5b8352fc8bd853acc29cf7268c99b79069d6adb60710f7489552a5ad30e285c

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