Malicious PDF — malware analysis report

Static analysis result for SHA-256 31eae989d31debf9…

MALICIOUS

PDF

80.4 KB Created: 2020-12-26 17:05:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d1e0b47d4361ea2dcac56a147981c9bc SHA-1: 9c7a2b7c10da5d3c678c04fa2aac45428db9e5a3 SHA-256: 31eae989d31debf9d576c99ce6703748a45aaab3fe011f7c7f1f97257e438deb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with many pointing to disposable hosting services. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV specifically flagging it as 'Pdf.Phishing.Trojan'. The embedded URLs likely lead to phishing sites or further malware downloads.

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
  • 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.
  • 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://trafffi.ru/aws?utm_term=the+tempest+character+analysis+pdf PDF link annotation
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/54b05a35bf4.pdfIn PDF document text
    • https://garijonomiwobe.weebly.com/uploads/1/3/4/7/134711127/8b786eb7.pdfIn PDF document text
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/bagajevinolujaw.pdfIn PDF document text
    • https://cdn.sqhk.co/sukurorezib/PijYlIV/36628394249.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/gj67mif/92145039173.pdfIn PDF document text
    • https://sarowamirubene.weebly.com/uploads/1/3/4/7/134736793/366039.pdfIn PDF document text
    • https://cdn.sqhk.co/wotutovebo/anikcjb/pazuj.pdfIn PDF document text
    • https://cdn.sqhk.co/xisiwuba/dFjjhau/8640799439.pdfIn PDF document text
    • https://jokuvaput.weebly.com/uploads/1/3/4/5/134589987/0358e2e9896.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/faigigk/singing_lessons_online_teacher.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c8f2bc4-beb8-43c8-a3b6-e07225c66a81/80266555469.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/agnes_martin_lugand_carti_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b51fcf-a788-4d16-bce2-25b469ee06c4/paint_night_albuquerque.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d54d4bfe-61a1-4ea8-a233-6a7e10d8b920/muwaxeraxofojapewoj.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/burosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4fc1388-4760-45a1-aaf4-2f412a27670e/58377533774.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_off0000fe9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9D 5444 bytes
SHA-256: 0a67fa5c0028985e1d9d986a8c7ecedfbe8b8228ba5fc756a07b32dd67f5180e
font_01_sfnt_off000110ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FF 10444 bytes
SHA-256: 35c5d1823173a722b9635337b93af99aa12ea71bacc26d877541ed35c7a165e4

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