Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d4d7aca88015fc…

MALICIOUS

PDF

66.4 KB Created: 2021-01-06 08:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 20165ceabfa874117af26c5d9ea840dd SHA-1: b8f6ce8a44055311ae378a8043488f221d74c3c4 SHA-256: 94d4d7aca88015fc5a5c56ac878a1a289108206f11e9deba5262452ea2faa2f3
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or phishing campaign. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence score point towards a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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=benin+gospel+music+audio In PDF document text
    • https://static.s123-cdn-static.com/uploads/4386622/normal_5fe10b03e8c40.pdfIn PDF document text
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/sepofuzal.pdfIn PDF document text
    • https://rirulejirosajis.weebly.com/uploads/1/3/4/3/134320684/jifefenugetifosamip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417675/normal_5fac302c418c9.pdfIn PDF document text
    • https://kaxebovirufuj.weebly.com/uploads/1/3/4/3/134399635/duzipela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368969/normal_5fa7fe526138c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481990/normal_5fc83f48e8211.pdfIn PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/6746eb955d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445570/normal_5fad922dd9a8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482189/normal_5fbe1d0be4625.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426679/normal_5fdf9e77820f6.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/petubapizo/vidmate_2017_apk_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/ancient_greek_grammar.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/rivowosubisogoxux.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/22594828423.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/alastair_reynolds_house_of_suns.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/englisch_abitur_2018_bw.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_off0000c61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61B 5348 bytes
SHA-256: 78e3787c13c036a6f552e645b2d1565cda3d9ea8bbd3f6eb1aa9fa42fa4329cb
font_01_sfnt_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 10884 bytes
SHA-256: f250cf503639700275dd47e7d5d748891cf04f43dc4b8020d5c234470f144315

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