Malicious PDF — malware analysis report

Static analysis result for SHA-256 943210fe650db831…

MALICIOUS

PDF

70.6 KB Created: 2021-01-23 02:20:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 54ad0f6f3780fa7d4ab36d7a842f1546 SHA-1: 1c31c141c91217d8a6af4628e307a30872eac0dd SHA-256: 943210fe650db831c634c4f26f0ac2b7c6669db4f6ce166e10b309ca4908dc16
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 flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a large number of external links, many hosted on disposable domains, indicates a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm suggest it is part of a phishing or malware distribution scheme.

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://crophysi.ru/123?utm_term=an+auditor+assesses+control+risk+because+it PDF link annotation
    • https://cdn.sqhk.co/lirotigi/jagiEmn/star_wars_rebels_sequel_trailer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413714/normal_5fd7c192057d7.pdfIn PDF document text
    • https://cdn.sqhk.co/birugafomafo/7FnifG5/tolapakitufimubixanaso.pdfIn PDF document text
    • https://zezupivipikoko.weebly.com/uploads/1/3/4/5/134596705/7676262.pdfIn PDF document text
    • https://cdn.sqhk.co/naveropifo/kidqibs/tadiza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368235/normal_60012d5220b2f.pdfIn PDF document text
    • https://duketexu.weebly.com/uploads/1/3/4/7/134725944/kukorolexin.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/iijihhi/54601489746.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384035/normal_60062a95e6956.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/esihyif/54202315458.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/idKzhjc/54957226567.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/7122bf3c.pdfIn PDF document text
    • https://cdn.sqhk.co/mofinopedas/jfAjeW0/48313677967.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382208/normal_5ffa73be4aa8e.pdfIn PDF document text
    • https://nusimilanagazi.weebly.com/uploads/1/3/1/4/131454102/2094257.pdfIn PDF document text
    • https://lixagomifele.weebly.com/uploads/1/3/5/3/135323016/5eecc89c2830.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C6 5128 bytes
SHA-256: eb5d1d8eb82894ae3dd5dd9f20b72251521021fb5f68121bb28d96730c9dd9ee
font_01_sfnt_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 10068 bytes
SHA-256: b83230a29f2c5ab84b7eebf6accaf7e2f409af8ee0119fd39c1b92d3e28db3a0

Open this report in the interactive analyzer, or submit your own file for analysis.