Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8798b463cba3187…

MALICIOUS

PDF

67.9 KB Created: 2021-02-16 13:23:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9124ee8f12341dabc7a062a60196b18a SHA-1: f0667af65a6da30f2432030d01a282ccd9320e32 SHA-256: b8798b463cba31877b20d8faf0292d9905d40c9fecaf8d890363e537c1be0fd1
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 identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The PDF_SEO_LINK_FARM heuristic suggests a tactic to generate traffic or distribute further malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or SEO spam campaign.

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://seumenha.ru/wix?keyword=coniferous+and+deciduous+forest+soils PDF link annotation
    • https://rivabugejovo.weebly.com/uploads/1/3/0/7/130739095/nafidoxadevuzunimot.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/ejjdjhl/28507866964.pdfIn PDF document text
    • https://jifalutisapore.weebly.com/uploads/1/3/4/7/134772579/mukapixopa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369318/normal_5fd0745257d09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424666/normal_5ff763639463e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380522/normal_5fcbd2a1f26b5.pdfIn PDF document text
    • https://juxufosuzuvol.weebly.com/uploads/1/3/1/4/131437906/6241496.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500667/normal_5fe007d0e5f37.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/hfwTFyd/sogokepipelata.pdfIn PDF document text
    • https://cdn.sqhk.co/wukomidekepu/gejagd4/virafugurexewisevilibiw.pdfIn PDF document text
    • https://cdn.sqhk.co/remigalakefo/1hiUijY/color_fill_3d_app_store.pdfIn PDF document text
    • http://muzotom.22web.org/1918704746.pdfIn PDF document text
    • http://bigowet.xyz/gametogenesis_mcqfbu5o.pdfIn PDF document text
    • http://shoop-fm.ru/37061132749959qr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bomajada.epizy.com/ultraviewer_6._1_portable.pdfIn PDF document text
    • http://jupanifoz.epizy.com/walker_buehler_injury_report.pdfIn PDF document text
    • http://niserikotul.rf.gd/18206460931.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_off0000cf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3B 4920 bytes
SHA-256: 43cc98b89d58a816c0813dd7f2a0042fcbe58f300766af530e137429dbfb4e05
font_01_sfnt_off0000e005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE005 10152 bytes
SHA-256: 8b2f9026e288f1b13d3e55dbd9c29717917a5a23348dd74becd81d87b9132927

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