Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb78acd4bde0d94…

MALICIOUS

PDF

74.3 KB Created: 2021-03-17 06:57:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fedabfdcfaec4950a98b34704cc77b72 SHA-1: de382df901a6e88f2190aaf7e7113f9b0109363c SHA-256: fdb78acd4bde0d94e73973850f268063f685fdc5a3ae709527332ecacff8e600
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external URIs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to a search query, directing users to malicious websites. The presence of external URIs suggests an attempt to redirect users to phishing or malware distribution sites.

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://druttle.ru/strik?utm_term=does+sookie+and+bill+end+up+together PDF link annotation
    • http://kawlites.online/fuvepedozeromfnk0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406789/normal_600d3e707de9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459176/normal_602aa3b9c60f3.pdfIn PDF document text
    • http://zhk-rekord.info/tonizadalagoruxaseviwomj2ug.pdfIn PDF document text
    • http://mozaduz.mygamesonline.org/33017525531.pdfIn PDF document text
    • http://jumofusifabezol.66ghz.com/9602020377.pdfIn PDF document text
    • http://getchambre.xyz/marketing_entry_level_jobs_nycd0njj.pdfIn PDF document text
    • http://theharaka.online/zuwupoxacpico.pdfIn PDF document text
    • http://peskomment.ru/3835088038151cc1.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/rca_5_disc_cd_player_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_602ede8de061b.pdfIn PDF document text
    • http://leopards.space/chainsmokers_songs_zip_filearmj9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463830/normal_600c6280479cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sawesupunozigiv.atwebpages.com/1776247521.pdfIn PDF document text
    • http://xojakejib.epizy.com/4562519293.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/kovivajejad.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/stryker_sr-655hpc_control_software.pdfIn PDF document text
    • http://xojozemuxubiv.epizy.com/62352503025.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 5424 bytes
SHA-256: 16ed7ae8227b9afa0393e12d58a24eef60517943f0c48f9211e193fb7f8ff0f7
font_01_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 10924 bytes
SHA-256: 7fd052cd63c4b09ffccf4448afa2c0661b3a3953f6eb857ce506c28541474065

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