Malicious PDF — malware analysis report

Static analysis result for SHA-256 558eb55298144ae7…

MALICIOUS

PDF

86.1 KB Created: 2021-03-15 20:57:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 341bb0f543ec80a0b5959cd5044650d4 SHA-1: e9cff9e75ccbf656649e656dfcd04026163d414c SHA-256: 558eb55298144ae72abbf78f4a7605ff2cff79c1c9eefb1fc0f103afc96a13a4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/strik?utm_term=a+song+of+ice+and+fire+online+game PDF link annotation
    • https://cdn.sqhk.co/xizaxulubezu/LjhPhdX/xotuvujadut.pdfIn PDF document text
    • https://kiziwovoxapi.weebly.com/uploads/1/3/4/6/134617524/xetedetato.pdfIn PDF document text
    • https://cdn.sqhk.co/powurejur/qCibgoP/17858227640.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/i0fighi/sopilunumudosuviwafowov.pdfIn PDF document text
    • https://fezuwujazu.weebly.com/uploads/1/3/5/3/135347069/1973629.pdfIn PDF document text
    • https://cdn.sqhk.co/goxupolofodi/aijhgcB/lucky_ali_song_lyrics_o_sanam.pdfIn PDF document text
    • https://cdn.sqhk.co/kasesiseb/VuujbgJ/verizon_authorized_retailer_cellular_plus_gillette_wy.pdfIn PDF document text
    • https://fibobamoga.weebly.com/uploads/1/3/1/6/131607866/2f75ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://todizugofufufax.epizy.com/morupalulemezukixerelebe.pdfIn PDF document text
    • http://buwebone.epizy.com/tepar.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/gilekijipanikukitaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48d6fa90-8862-4620-8595-9199a2a7c2c0/best_poetry_to_read_for_beginners.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/sap_hana_free_online_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1abd119-9623-4d05-a6be-cc8f0762bc43/77190311894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/954cdd5d-0993-4b9a-9e57-93b42e9ef46b/74306566762.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_off00011143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 5328 bytes
SHA-256: 3923252cb7de9d801f4cff73fc5a23b2a84e81a2a5bef1b15859c298e0022fdb
font_01_sfnt_off00012353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12353 11896 bytes
SHA-256: 52b1d1c889ad74e77a7922b6d981df179691ff636f9b54b50cccd14295bb6c60

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