Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e43f2c1fc900539…

MALICIOUS

PDF

69.0 KB Created: 2021-01-16 10:18:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d968e89d56552a0f301b67099846af98 SHA-1: 747113b87190268a00aadc105b9c78ed182c0c62 SHA-256: 3e43f2c1fc900539de39a8efacf7ed62b42d8722ee1824ecb10ce1fcf2d5d506
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to reference 'Band of brothers theme sheet music', suggesting a lure to entice users to click on the malicious links. The ML classifier and ClamAV detection further confirm the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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/123?utm_term=band+of+brothers+theme+sheet+music In PDF document text
    • https://cdn.sqhk.co/noxibogalu/djajdJ1/36800862303.pdfIn PDF document text
    • https://site-1173293.mozfiles.com/files/1173293/tennessee_titans_covid_update.pdfIn PDF document text
    • https://konanofekevofi.weebly.com/uploads/1/3/4/3/134367310/letibi.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/YNhjXqu/cartoon_lion_running_gif.pdfIn PDF document text
    • https://sozatugija.weebly.com/uploads/1/3/4/8/134859818/4048400.pdfIn PDF document text
    • https://site-1167986.mozfiles.com/files/1167986/zipujavosumukedirave.pdfIn PDF document text
    • https://soxexovefulobi.weebly.com/uploads/1/3/1/4/131484328/timobijorodoxitaj.pdfIn PDF document text
    • https://site-1173734.mozfiles.com/files/1173734/bumuveru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407084/normal_5fc3b11e686f5.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/kasodopizafazakoxuk.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/vetamedisoz/answers_to_math_word_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/free_home_construction_cost_spreadsheet.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_off0000d064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD064 5416 bytes
SHA-256: 396c1f1810851ea5fee242068f0eb184749342f193002dcba798cee2f9f647f1
font_01_sfnt_off0000e2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 10832 bytes
SHA-256: 93ef210b89afefaa5fadf772d624e45ab5126364d1433ada95052b3c3ce91582

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