Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd39cd83fbf9b329…

MALICIOUS

PDF

75.8 KB Created: 2021-01-16 03:52:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: db5d72647b93642dc8094ef8536b2fca SHA-1: 47e2d24031e8dc1ffdcf6c2a6ad853c660693ab5 SHA-256: cd39cd83fbf9b32907ed86e8cb8b8a80a87ada703d2e8babc2887fd9552a6ced
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The SE_INVOICE_LURE heuristic suggests a phishing pretext. While no scripts were explicitly extracted, the ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics confirm the malicious nature of the PDF, likely exploiting a vulnerability to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ggtraff.ru/aws?utm_term=proforma+invoice+template+xls In PDF document text
    • https://site-1193936.mozfiles.com/files/1193936/10510822206.pdfIn PDF document text
    • https://gadolelexuzited.weebly.com/uploads/1/3/4/4/134486477/7b2135.pdfIn PDF document text
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/nozil_pidefexenefa_padan_xejujexutew.pdfIn PDF document text
    • https://site-1174611.mozfiles.com/files/1174611/22972593124.pdfIn PDF document text
    • https://dunopupusegujuz.weebly.com/uploads/1/3/4/3/134348927/9079326.pdfIn PDF document text
    • https://site-1168267.mozfiles.com/files/1168267/10116445318.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405193/normal_5fdf33207cbdc.pdfIn PDF document text
    • https://site-1172255.mozfiles.com/files/1172255/bird_screamer_gun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wixatax/zimazabumiruwesa.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/49626998026.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/blasphemy_in_pakistan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 5080 bytes
SHA-256: 12fd1c445e0d5022b43c7c22199ab1438fe806babbb7ee73b71262b3ead44975
font_01_sfnt_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 10032 bytes
SHA-256: f584c4ede14f09b3dfa40d3d055e80b0c8abf8990023010675c04f8cd521a6db
font_02_sfnt_off000114af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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