Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ef16317ac959e4…

MALICIOUS

PDF

63.3 KB Created: 2020-12-18 11:54:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 2b18d373eddecc09dd744f9a5fd5e5d3 SHA-1: 25ca2f059da3d82c8b3b5d0842e6a669da52d13c SHA-256: 23ef16317ac959e4fade53daca00bb1c7d0be160f68e8330f7b75714744b9db8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=chapter+11+furniture+auburn+maine PDF link annotation
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/tuboguloxigezu.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/nenajapus.pdfIn PDF document text
    • https://gonoloxezejuje.weebly.com/uploads/1/3/1/4/131410007/d257913a498.pdfIn PDF document text
    • https://fatatovol.weebly.com/uploads/1/3/4/7/134707957/5355096.pdfIn PDF document text
    • https://zipalusub.weebly.com/uploads/1/3/4/3/134343211/zijusaximaki_tuxoxosapuxer_wugegifegazad.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/bazarerin-surilugajexu-jusibut-jopaxig.pdfIn PDF document text
    • https://nedudefo.weebly.com/uploads/1/3/4/3/134389218/a93f0eddca.pdfIn PDF document text
    • https://xikematevi.weebly.com/uploads/1/3/4/3/134392378/4c7c04.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/vusivivesap-newevagubiduvug.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
    • https://uploads.strikinglycdn.com/files/0447a4f6-e80f-4c1e-9c3c-c5702d9df7f5/funny_office_gifts_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5732061b-5567-47e7-aa61-6a946e9dda2a/73926914238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c65b530-c95b-4253-8696-73a4e8fe946b/best_spell_mastery_5e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE84 4920 bytes
SHA-256: 2a913eb73336b8d8b99c9813e04b0d27b0d50a9b508861c42e327f6f15abba81
font_01_sfnt_off0000bf16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF16 10292 bytes
SHA-256: 59be220b7f696daba6ba34121699c1bb6dfda27e7bff9ce2f7ec79e5579f626c
font_02_sfnt_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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