Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdfe28b2d254249…

MALICIOUS

PDF

58.1 KB Created: 2020-12-17 19:59:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 89e75c0ee113a07923ef924031596f10 SHA-1: dcba47e92c1261eaf9e585d9eddb0da967e92269 SHA-256: 7bdfe28b2d25424923bf7e7818c963806566e34e7236aeeb98ced71d69da200e
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 detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, containing numerous external URLs, many hosted on disposable domains like weebly.com. The primary URL, 'https://traffset.ru/123?utm_term=north+scott+powerschool', suggests a potential phishing or scam lure, possibly related to educational institutions given the 'powerschool' term. No scripts were extracted, but the PDF structure itself is used to facilitate the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/123?utm_term=north+scott+powerschool PDF link annotation
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/rinuvetes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5fbfe9a940689.pdfIn PDF document text
    • https://jinuvavuvebox.weebly.com/uploads/1/3/4/6/134612635/0f87943b9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367905/normal_5fcf5d5d46dd0.pdfIn PDF document text
    • https://ledijonag.weebly.com/uploads/1/3/4/6/134689342/legawifet.pdfIn PDF document text
    • https://wikoriduban.weebly.com/uploads/1/3/4/3/134341401/5523e8.pdfIn PDF document text
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/gisudix.pdfIn PDF document text
    • https://fapezadedafax.weebly.com/uploads/1/3/4/6/134609176/8932896.pdfIn PDF document text
    • https://nalovitifa.weebly.com/uploads/1/3/4/6/134600698/3dc03ed9.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/tobovunoberiki/29117327801.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc27abd116eb00e3c55ea17/t/5fcd6539920f47545ba6a0a5/1607296313310/14802515066.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_off0000a9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9C2 4872 bytes
SHA-256: adae6a8c5b11923603bef04f020887742e8738bf7d5329cd4e157aa91f37f9c0
font_01_sfnt_off0000ba6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6B 9884 bytes
SHA-256: 40d9b3276e1dd91f0d8a59d7c3ccddb59bab9e57e45c0c6b8a09e53a9e67863a

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