Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff389a18e539329…

MALICIOUS

PDF

75.4 KB Created: 2021-04-18 22:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 05391297fd2198b0f64afc512abb796d SHA-1: f87b68145a624581feb255128173f67b1282306b SHA-256: 3ff389a18e53932977db40ab0c4fc4752309cb0b204626de2002ad2653fc6a76
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection for phishing. It contains numerous embedded URLs, many pointing to disposable or suspicious domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains strings related to software licensing, which is likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/strik?utm_term=construct+2+personal+license+free PDF link annotation
    • https://putukaxuke.weebly.com/uploads/1/3/1/4/131437363/4518802.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/lunoropixu.pdfIn PDF document text
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/7868531.pdfIn PDF document text
    • http://tanolugulutewu.medianewsonline.com/coupling_of_alkynes.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/58325465291.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459029/normal_5fcdaf81c7df5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417405/normal_5ff268502e65e.pdfIn PDF document text
    • https://mefufexuwi.weebly.com/uploads/1/3/4/0/134019004/metuvegajufed.pdfIn PDF document text
    • https://gobebirerelimi.weebly.com/uploads/1/3/4/6/134651667/5814119.pdfIn PDF document text
    • https://jonumijam.weebly.com/uploads/1/3/0/7/130739239/narog_batutoweg_vubaxasu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2424b24c-27d7-4f0b-88b8-d2af18a75a51/48355803044.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/createspace_cover_template_generator.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/john_grisham_camino_island.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d84224d-2499-475c-af34-7fa6dbc6ecf2/35236611337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46faa219-45dd-4f40-a01f-3812a35576e8/zegofimifagabemor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a205e2eb-add8-485a-abe2-1caeb0ea23b8/manual_de_utilizare_delonghi_magnifica_esam_3300.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/30372972543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4118a909-37a1-4f1e-8f2a-96729841cf26/xojetopezasexizujekevej.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/83838784381.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/tuxanafonorekosup.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/best_cv_template_for_teachers.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/dragon_age_origins_awakening_xbox_one.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_off0000eb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 5044 bytes
SHA-256: 0de5a3e561b5a5f5921eef96e5d8fd90ed205c84191f51a2c3f5d7630fd277bb
font_01_sfnt_off0000fcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC7 10284 bytes
SHA-256: e1394a3558b4457102a03c5aa38270de4f57991602c5ea893ba3b0db589611a1

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