Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e2d5b59e916649…

MALICIOUS

PDF

107.8 KB Created: 2021-03-11 04:30:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6a7dada28d434f630c76287a7aace239 SHA-1: dcc598311a975e20e554a1e7d5e0f0324d46e7fb SHA-256: 81e2d5b59e9166499a49528ee7d549eff65384c3522604c620f48dc8c52ae634
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged 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 directly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment, likely leading to a malicious payload or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://jottigo.ru/123?utm_term=an+anchored+sheet-+pile+bulkhead PDF link annotation
    • https://cdn.sqhk.co/xojoweva/0gecgcR/rutolosifikagoniwegapixor.pdfIn PDF document text
    • http://lusolakidareve.mywebcommunity.org/6536012544.pdfIn PDF document text
    • http://fbdirect.site/bana_masal_anlatma_tek_para_full_izleppecv.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/khbITfd/best_switch_games_2019_kotaku.pdfIn PDF document text
    • http://vadosaj.getenjoyment.net/66282323585.pdfIn PDF document text
    • http://topvideo.design/walmart_photo_promo_code_honeyzr1lq.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/Dzoyjib/kotamitabasumoboz.pdfIn PDF document text
    • http://xunopapazugatar.medianewsonline.com/kujunufasaxat.pdfIn PDF document text
    • http://prodit.space/8964852484lv8s0.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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://laguzovola.rf.gd/29442249430.pdfIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_7ee3ba315e8c4a46b454be27cdbcdac0.pdf?index=trueIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_7e184328c22c4fe08d5ef68442820b25.pdf?index=trueIn PDF document text
    • http://nukilaba.myartsonline.com/stokes_theorem_problems_and_solutions.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/tcp_ip_guide.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/disokisusumizazo.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_8c28374dc9bd491e9f4ad170756f262a.pdf?index=trueIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_ecc8f207e69e4300967cbd41ae8cb2b1.pdf?index=trueIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_2c50ea49e77c4a48b39f199a5fb68d47.pdf?index=trueIn PDF document text
    • http://lobaman.epizy.com/50210324717.pdfIn PDF document text
    • http://kavozusuzoluwun.rf.gd/41703357140.pdfIn PDF document text
    • http://rivenoke.onlinewebshop.net/14936728286.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001027e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1027E 17016 bytes
SHA-256: d578ce0a89690394bd696975bcf538fc1061ff6323d2090be7294821284acb35
font_00_sfnt_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 5384 bytes
SHA-256: e72c0077fc210abb1032997cba7db29f137041b2430247eb8f5bffe1dcdabad9
font_02_sfnt_off00012e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E01 7848 bytes
SHA-256: 8be97a20ebfe3de60204f12654f7043c689c0f6f0cced5870494e4ba49431ec3
font_03_sfnt_off00014397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14397 23288 bytes
SHA-256: 2e20a5a4b423559b746adbb08a631ecf85499ef502af908fbaaf8e29da021dd5
font_04_sfnt_off0001866a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1866A 17548 bytes
SHA-256: 97c75a9fee84ecd0401048c384e4dc38c26e3639d20c5d5f6b741a9d934eab4e