Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40b583601151ddb…

MALICIOUS

PDF

75.5 KB Created: 2021-01-11 10:11:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 681305b37a0270afa56013e5f479d578 SHA-1: 22e6657c59c53eb8240a3c3141b22131e9800ba9 SHA-256: c40b583601151ddb8d3a95b45cea63dad60e3db822ba79e383f325e113de2a7f
126 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 a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The document contains numerous external URIs and is structured as a link farm, directing users to various disposable domains and file-hosting services. The presence of embedded URLs suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafffe.ru/123?utm_term=the+teenage+liberation+handbook+for+sale PDF link annotation
    • https://pemogadisazur.weebly.com/uploads/1/3/4/5/134583379/309b8585.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/ijge7dR/sceptre_tv_65_review.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/iegjthc/putopuxomalepujiwaden.pdfIn PDF document text
    • https://site-1177333.mozfiles.com/files/1177333/petal.pdfIn PDF document text
    • https://site-1178275.mozfiles.com/files/1178275/denda_tilang_sim_motor_mati_2019.pdfIn PDF document text
    • https://site-1174957.mozfiles.com/files/1174957/horror_orphanage_map_mcpe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375070/normal_5feb7bb1761ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485445/normal_5fcb95ac0bac3.pdfIn PDF document text
    • https://site-1174981.mozfiles.com/files/1174981/nike_icon_clash_leggings_grey.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450734/normal_5fc7db5820449.pdfIn PDF document text
    • https://site-1173240.mozfiles.com/files/1173240/lowamavaxigifusufarotajiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489732/normal_5fedce5311498.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_off0000e8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 5324 bytes
SHA-256: bf0770565ab365570a41c46aee9e7294b2c2cbf61ced13abc2ac94d714dddedb
font_01_sfnt_off0000fae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 11252 bytes
SHA-256: 3a599e0516844cfbd42aae2b47cc65991d093b3ecd540dd497d205dd2294ec53

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