Malicious PDF — malware analysis report

Static analysis result for SHA-256 c968102674a53fb5…

MALICIOUS

PDF

78.3 KB Created: 2021-03-23 17:35:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5295fa29406fa6fa9b4e892b12778182 SHA-1: 5a3177d0273ccabe5ff529015d7ce967f13a3bbf SHA-256: c968102674a53fb561f1324665e93b0b92e080357cd4873af920c5abab52b570
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary focus on luring users to download software like 'Oracle weblogic 12c'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and embedded URLs point to a phishing attempt disguised as a software download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=oracle+weblogic+12c+download+for+linux
    • http://fortuneo-enligne.com/gupegujoke1ctno.pdf
    • http://zegererevez.medianewsonline.com/72049997045.pdf
    • https://static.s123-cdn-static.com/uploads/4414867/normal_5ff7b9447ca04.pdf
    • https://cdn.sqhk.co/vasibejovej/ggicSGw/zupegaxa.pdf
    • https://cdn-cms.f-static.net/uploads/4490252/normal_5fd76c0bc96ba.pdf
    • http://smartcreditscore.info/how_do_i_charge_my_ravpowere3n5a.pdf
    • http://fogafiv.mypressonline.com/audincia_de_custdia_no_processo_penal_brasileiro.pdf
    • https://cdn.sqhk.co/kewesowovim/h4gf8nC/kizuputorijajitonib.pdf
    • https://cdn-cms.f-static.net/uploads/4424689/normal_60120e133e4ed.pdf
    • https://cdn.sqhk.co/rularijulen/pS8gdhf/aimpoint_golf_putting_charts.pdf
    • https://cdn.sqhk.co/zosiwikiw/bJDihia/advance_auto_parts_jacksonville_beach.pdf
    • http://lukanovetefitef.22web.org/editing_documents_in_preview.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xazibubemefejo.epizy.com/ipad_mini_2019_case_with_pencil_holder.pdf
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_34f53238e32e4a0d8cf505c93b41d60b.pdf?index=true
    • http://pinakebe.rf.gd/twilight_2_movie_download_tamilrockers.pdf
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_39b3249098ee4cbba5aae3dec45ced0a.pdf?index=true
    • http://timojodabemisux.myartsonline.com/all_types_of_hand_embroidery_stitches.pdf
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_16a92911233a4a77933342873457a649.pdf?index=true
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_94a9f8e683f543ed9a66cc2b20d3d301.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f087.bin
376d3a8afe810939852a2ee1997bc4668489cf49899e8541869bf1706b1623ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 5524 bytes
font_01_sfnt_off00010377.bin
2f9394100d37d533262b758388614b538b6608ccabb22a0a3698726cf18b9e30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 12116 bytes

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