Malicious PDF — malware analysis report

Static analysis result for SHA-256 83626d3728cc2cbe…

MALICIOUS

PDF

70.7 KB Created: 2020-12-20 19:37:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 915ae8922cd5e2e31587b4dbc571de2c SHA-1: 25e16976ab8ff0851508fa416086688e5f98fb5c SHA-256: 83626d3728cc2cbef5a3c0b1b8cb1d6c75db33742db283057404ae1517967c79
222 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting a phishing or malware distribution attempt. The presence of invoice-related language further supports a lure-based attack pattern. While no scripts were extracted, the PDF structure and embedded links are indicative of exploitation for client execution, likely leading to further payload delivery.

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 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.
  • 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://traffmen.ru/aws?utm_term=define+variable+in+rtf+template In PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/nipuvixavup_roxudek.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/patakume.pdfIn PDF document text
    • https://xuvosaxefon.weebly.com/uploads/1/3/4/6/134605895/7096749.pdfIn PDF document text
    • https://xijiruxexewige.weebly.com/uploads/1/3/4/7/134725886/07868b92d5ce422.pdfIn PDF document text
    • https://tujulita.weebly.com/uploads/1/3/4/6/134687611/f7778b030b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488560/normal_5fafb9dc874e6.pdfIn PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/2148444.pdfIn PDF document text
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/7d7ccd538e74187.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/zurovajij/50888875387.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/anlagenverzeichnis_bewerbung.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/350ffc77-29e2-486d-bb00-44778c5ac75d/71462740277.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/german_apple_streusel_sheet_cake_12_tomatoes.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/49642931876.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/mutuvigepizu.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/evidence_based_nursing.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_off0000d748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD748 5068 bytes
SHA-256: 252d21d20b2033d1c14aefb7f7bd074bc3e9aba26372b24cb0a892eb467eda4f
font_01_sfnt_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 11040 bytes
SHA-256: e0d9c478a13589d5e45a8e67f0384e5140033f14b30ac635fbb46ec9e94b5d1c

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