Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d939f117e72919…

MALICIOUS

PDF

74.8 KB Created: 2021-02-21 01:16:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 78f27f8bbdbda289ef5a170d0a52b8c8 SHA-1: b8ff1d8474acda5a524e381411c2fe982f68b9fb SHA-256: 58d939f117e72919547d9325f139374432713961e93d11518a3ce22a2a37f8d3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external URIs, with one pointing to a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=starbucks+holiday+cold+reusable+cups PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392857/normal_602f73c8a7e20.pdfIn PDF document text
    • https://cdn.sqhk.co/zazerejaxu/Yjcigba/heroes_magic_world_inferno_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/zitedefew/JQyaaia/3820250050.pdfIn PDF document text
    • http://lastasked.com/mugojudoto7r5ot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_601bfcaa33995.pdfIn PDF document text
    • http://vafutixon.22web.org/tisipilevemudosonumekudaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452193/normal_5fe98c9bd5821.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/jhUrhb2/face_masks_walmart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449781/normal_601512c946dfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474759/normal_602463e1ac2fa.pdfIn PDF document text
    • http://lovelyhouse.online/9433178003c1uni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://mutidulofof.epizy.com/adobe_illustrator_trial_version.pdfIn PDF document text
    • http://fazozogujezeto.rf.gd/83520425872.pdfIn PDF document text
    • http://xenemusexo.epizy.com/poretenugopufotusexo.pdfIn PDF document text
    • http://wemefozes.rf.gd/popabenixorobejobesovajaz.pdfIn PDF document text
    • http://bemeridalazobox.epizy.com/ziparurunifolowolubaj.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC619 5568 bytes
SHA-256: 1cc8adcb03275af68afcddaf63336431132f75d53b934637b77b6698ed91fde1
font_01_sfnt_off0000d8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FA 1876 bytes
SHA-256: 5f253fa7c3d91980460d014a67c32437e14d5c2947e17669986eb648630747bc
font_02_sfnt_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 7772 bytes
SHA-256: afa46c615c26fa60fc3a52ef66c770224ab6ae60452fc0dd2f94d1da74766eae
font_03_sfnt_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 10676 bytes
SHA-256: 8bd0035fbd54d2efddbf203cff64ee44974dde408fcb0bde33e9ff5dde9b2732

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