Malicious PDF — malware analysis report

Static analysis result for SHA-256 8233ea1498fbe805…

MALICIOUS

PDF

82.4 KB Created: 2021-02-05 15:48:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 38cfb45da57c01bf1d58385652be4c41 SHA-1: eee2c095408b54f19272752068b4e61cb72e40e0 SHA-256: 8233ea1498fbe80554132ec35e04f66b39398befde0b606aba3631a14b86af08
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various domains, many of which appear to be disposable hosting services, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malicious redirection attempt.

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://leonvi.ru/123?utm_term=star+wars+kotor+jedi+code PDF link annotation
    • https://cdn.sqhk.co/fatifofab/cjbyeii/diners_club_us_corporate_login.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470038/normal_5fe445970d093.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/uMIjjha/flexeril_side_effects_alcohol.pdfIn PDF document text
    • https://cdn.sqhk.co/wuseguwe/YzKje2X/60251262308.pdfIn PDF document text
    • https://dibumofum.weebly.com/uploads/1/3/5/3/135313591/xedokisewodawumun.pdfIn PDF document text
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/73523737b01.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebililofo/ibChgbw/minecraft_news_server.pdfIn PDF document text
    • https://zuxijonimobazi.weebly.com/uploads/1/3/5/3/135351106/b12091760.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/hKjdgea/dejajesisono.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/2034619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5fd0bb67e4a7c.pdfIn PDF document text
    • https://redulexaxoxega.weebly.com/uploads/1/3/0/8/130874010/jamogadofivexototozi.pdfIn PDF document text
    • https://neseroto.weebly.com/uploads/1/3/5/3/135326238/afb97e0.pdfIn PDF document text
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/01b89ea3d6027.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/B9jfrha/speed_motorcycles_for_sale_near_me.pdfIn PDF document text
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/9553815.pdfIn PDF document text
    • https://kekoweditolig.weebly.com/uploads/1/3/2/6/132683085/gezil-weson-jefap-kakinenez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 4916 bytes
SHA-256: 80b815b73bb1c77b16b0755c5b0fe21cb9ea4d4bfa8e747ebb8453f393d869c8
font_01_sfnt_off00010a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A58 10520 bytes
SHA-256: 8bf638d1a7dfdd193add23314d4b9fd0b42f06a664e619d6b70548b3e29028a0
font_02_sfnt_off00012e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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