Malicious PDF — malware analysis report

Static analysis result for SHA-256 a477cb5c65bc5332…

MALICIOUS

PDF

75.3 KB Created: 2021-01-11 12:28:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6c540383313519837609459f2a15d2bd SHA-1: eb3bd18fef18306a3f09f4157fe7f508809e1c3e SHA-256: a477cb5c65bc5332f1fdfa397bbb07469c488d2dad465427690b30bfae681b0b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The PDF contains numerous external URIs, with one prominent example being 'https://trafffe.ru/123?utm_term=pregnant+strapless+bridesmaid+dress', suggesting a phishing or spam campaign. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful content.

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 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://trafffe.ru/123?utm_term=pregnant+strapless+bridesmaid+dress PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484364/normal_5fc3334be9ff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444092/normal_5faa6ad6cf323.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/Njc9Uid/solezusoxumexanofi.pdfIn PDF document text
    • https://site-1168289.mozfiles.com/files/1168289/download_need_for_speed_no_limits_hack_iphone.pdfIn PDF document text
    • https://site-1176337.mozfiles.com/files/1176337/21868333455.pdfIn PDF document text
    • https://site-1166595.mozfiles.com/files/1166595/dumisadonokevav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485579/normal_5ff93574d8896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425784/normal_5fa76b3f615c0.pdfIn PDF document text
    • https://wopusuxosar.weebly.com/uploads/1/3/4/5/134583764/jevulupitavuromefari.pdfIn PDF document text
    • https://dofafurubes.weebly.com/uploads/1/3/4/7/134762343/wugejewedif.pdfIn PDF document text
    • https://rakerekibakefe.weebly.com/uploads/1/3/4/5/134596095/sogasisesa.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/dowesitobuga/47126428831.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_off0000dcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD1 5100 bytes
SHA-256: 9d2edf9c0416ebb49a4a700eec084a53ca1705a81591ffe32935444ace50a246
font_01_sfnt_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 10696 bytes
SHA-256: 2fc641d56a7c388133f127089689d45df72985b24067e839d4021ffc8ed7461b
font_02_sfnt_off00011287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11287 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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