Malicious PDF — malware analysis report

Static analysis result for SHA-256 37dc49c47b7e0d9d…

MALICIOUS

PDF

91.4 KB Created: 2021-04-14 09:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c027c780afe6b9d1ec915ffce3237daf SHA-1: 8db08f7780616c222b2705a2d44fb5fc9a7cd2ce SHA-256: 37dc49c47b7e0d9db52c14418705ebaed7a29f328655ede3d5b25007d506a308
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. The document body, though heavily obfuscated, contains text related to product comparison ('Which is better jbl pulse 3 or 4'), which is likely a lure to direct users to one of the numerous embedded URLs. The presence of many external URIs and link farm indicators suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://maypoin.ru/strik?utm_term=which+is+better+jbl+pulse+3+or+4 PDF link annotation
    • http://gtmedis.com/fundless_sponsor_term_sheetn6qht.pdfIn PDF document text
    • http://zagejudivavi.sportsontheweb.net/isomerism_lecture_notes.pdfIn PDF document text
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/finikukonipigif-fuwidurivoj-vukaf-lojuravox.pdfIn PDF document text
    • http://xepuxesadara.mypressonline.com/tesda_bookkeeping_nc_iii_exam_reviewer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417045/normal_6036854f51934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480389/normal_6060301e72e62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499635/normal_6030302b72b7a.pdfIn PDF document text
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/nokesifuno_vugafavijixumor_fudojurun_xavifanorure.pdfIn PDF document text
    • http://gezetola.scienceontheweb.net/sutedavomumabukagajarigub.pdfIn PDF document text
    • http://faceit.su/66503515240yh8m4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410954/normal_6066f0033c6fd.pdfIn PDF document text
    • http://islta.fun/dejame_que_te_cuente_limea_juan_diego_florezp8bbf.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/3226954.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/advanced_pathophysiology_book.pdfIn PDF document text
    • http://sabumow.mygamesonline.org/87308390392.pdfIn PDF document text
    • http://crysety.xyz/3854658387w1p2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_603ce2443bcee.pdfIn PDF document text
    • http://bomepufibawil.scienceontheweb.net/doxukesikufuzakopelif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gefuwaw.atwebpages.com/redewendungen_englisch.pdfIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_cd1d27b2075b400ca01ef7c2b197ddfc.pdf?index=trueIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_12a9a08e216e492f8259f825ba0a87d4.pdf?index=trueIn PDF document text
    • http://bowegasobufur.myartsonline.com/ginopisuzidojujomegaxo.pdfIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_ee7b298dc380487e96f248e37a5d37c3.pdf?index=trueIn PDF document text
    • http://likutolejit.onlinewebshop.net/pobek.pdfIn PDF document text
    • http://xenexafa.myartsonline.com/wazokebafoxabanixa.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11276 5292 bytes
SHA-256: aca992bd910e96d8a36ac87a326632235af7379bd0c0b6719a61484504ba9932
font_01_sfnt_off0001248a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248A 11180 bytes
SHA-256: 01f3b456260136ae74f7a799ab0a9edd773c30eceec103288ca4bca55e02396c
font_02_sfnt_off00014a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A88 16148 bytes
SHA-256: 64f21e55c2f29c6f605e8f9fd96e7f7b34f9b4a26fdc717ddead948457370e3b