Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7db15ebfd5ed145…

MALICIOUS

PDF

63.9 KB Created: 2021-02-11 15:01:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7c0595662030c4b90b8ab40327a5cf7d SHA-1: e5b0d3de2e5a70aea2839614194d957dd2684a0a SHA-256: b7db15ebfd5ed1451e078f562239fa7bf8f3852e1280e07caa8648a432a139fd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs indicate a likely attempt to exploit users through a phishing lure or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://leonvi.ru/aws?utm_term=baseball+cap+snapback+template PDF link annotation
    • https://fojexoduzasob.weebly.com/uploads/1/3/4/6/134693365/fevudelevabidotid.pdfIn PDF document text
    • https://pevidutapare.weebly.com/uploads/1/3/0/7/130740538/nojowuroval_zobafanagajozif.pdfIn PDF document text
    • https://kajubuti.weebly.com/uploads/1/3/2/6/132680994/40205fec633.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/defotezuwo.pdfIn PDF document text
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/pifoferudepu.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/b8hh5hD/56970777797.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488090/normal_5fcceb53b8223.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/8Fihfje/castle_crashers_remastered.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzededoz/ehijicW/55203493320.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394060/normal_5ff419930edf5.pdfIn PDF document text
    • https://gebijodefilamoz.weebly.com/uploads/1/3/1/4/131406109/betuseliboz.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/pegebunov/4th_dimension_kanye_kid_cudi.pdfIn PDF document text
    • http://batalogafoma.epizy.com/accounting_standard_20.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/fagodotewopezawusew.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/hip_hop_dance_video_mp4_free.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_off0000c03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03E 5236 bytes
SHA-256: 435296492a2d03cd7984bb2fd33d650a1f5cb3ded96dc657649ed2fe79b68db3
font_01_sfnt_off0000d1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FC 9704 bytes
SHA-256: f579e14c02e9bd88642f837fa8b4849a952c3635d3f9e37402a826437e33089e

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