Malicious PDF — malware analysis report

Static analysis result for SHA-256 2144bf08454cf849…

MALICIOUS

PDF

67.9 KB Created: 2020-12-24 06:39:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: defe4e7995736e817c1cbf2e0d8c0eec SHA-1: efbdc1585ce7fa8d108263305daa064e46f069bc SHA-256: 2144bf08454cf849ded1b6193b235cb00235022293ebeba8613983b6f44ba174
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and redirectors, indicating a phishing or SEO poisoning campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded links, such as 'https://ggtraff.ru/aws?utm_term=google+chrome+browser+for+macbook+pro', are designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://ggtraff.ru/aws?utm_term=google+chrome+browser+for+macbook+pro In PDF document text
    • https://dopijixofovaje.weebly.com/uploads/1/3/4/6/134692352/xajepolepogomujibo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388274/normal_5fcca13929498.pdfIn PDF document text
    • https://nadaroxiwe.weebly.com/uploads/1/3/4/6/134688146/a54adf5624.pdfIn PDF document text
    • https://bopatixenokukab.weebly.com/uploads/1/3/4/8/134873261/8f3b19091a0.pdfIn PDF document text
    • https://noxerurivago.weebly.com/uploads/1/3/4/7/134767941/tumifumal-mefed.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/8da0033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f9697a34aa49.pdfIn PDF document text
    • https://noxazifegem.weebly.com/uploads/1/3/4/5/134596672/5426659.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369631/normal_5fdf7882d8175.pdfIn PDF document text
    • https://penusifobituje.weebly.com/uploads/1/3/4/3/134314418/zovob.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/pukaridimupo/eclipse_ide_for_java_developers_neon.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/sample_psychological_evaluation_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/vunex.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_off0000cb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 5756 bytes
SHA-256: de6c43c0a28bc99e849d9a93ab3b6a8af25d6ef659651f2d3051ba13dcc5a683
font_01_sfnt_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 10580 bytes
SHA-256: 5dcf1f5bab9d671d8122269d9d9973c071e869a2b2d672e14f65098a7845e6b0

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