Malicious PDF — malware analysis report

Static analysis result for SHA-256 980c458753b77c40…

MALICIOUS

PDF

97.6 KB Created: 2021-03-14 01:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5e19a24bacc84649f86b2a0d612dbb79 SHA-1: 7e9914e4e4085c139924c4301ef5e2e13ad482e1 SHA-256: 980c458753b77c40e5e52d684338db81468a24eb00a65f76a69300ccd3683d81
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of multiple suspicious URLs points to the document's role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/strik?utm_term=research+grant+proposal+example PDF link annotation
    • http://desajegurake.scienceontheweb.net/how_to_beat_the_labyrinth_botw.pdfIn PDF document text
    • http://pumaguli.scienceontheweb.net/atharvashirsha_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/xewazezikufi/fhhvnbI/facebook_inc_stock_symbol.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/hiCiaaR/vamubipararokefesemaka.pdfIn PDF document text
    • https://cdn.sqhk.co/gasalikuviz/chd1Rih/39566448065.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/cbls6Yf/73336286924.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/ibhchb2/tidanijelikosutivivoka.pdfIn PDF document text
    • http://zogometemo.sportsontheweb.net/weak_acid_and_weak_base_titration.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zewadajimenu.rf.gd/depeche_mode_wrong_free.pdfIn PDF document text
    • http://xarififipevi.epizy.com/tikudobenase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f71e98ef-ee95-4cb6-b87f-992d0fdbf2ad/what_is_the_meaning_of_the_little_red_hen.pdfIn PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_5625d62648f14e30b4e330bb78a46d5c.pdf?index=trueIn PDF document text
    • http://nifanokobo.epizy.com/45770459989.pdfIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_3cd388e6ed1543d6bce344c12e34338b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca2ead9b-3965-4012-97ba-5e42d20321b9/fluval_305_filter_set_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a25148fd-021e-4f3f-81f8-c8ad67ee8d7f/wopufibovonomowuvofizobes.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/pefofej.pdfIn PDF document text
    • http://zegolerugowo.rf.gd/28514076026.pdfIn PDF document text
    • http://zapudeni.epizy.com/17727884491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc5fd69e-ced5-4fa0-a56c-6ffa4a0885cd/napatomaxisike.pdfIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_79264a6589004b1f94b675b376dc89f6.pdf?index=trueIn PDF document text
    • http://zeroxezubanalil.onlinewebshop.net/reliabilt_pocket_door_frame_installation_instructions.pdfIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_b9480f25fad743b89b48314f5f39f31d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/275ce687-bf8a-4847-935a-c8f85cee2e51/1441883014.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_off00013f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9D 5424 bytes
SHA-256: e7cbda351473218db0510ae3519348fd5952cbdbfc552635faa4e49b2cc96fa8
font_01_sfnt_off000151f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F9 11428 bytes
SHA-256: c7ca9d7344a83e81e0052a2f9fd6e811280ef25e8660c2262541d320450a44db