Malicious PDF — malware analysis report

Static analysis result for SHA-256 e937a18f0329c55c…

MALICIOUS

PDF

75.2 KB Created: 2021-03-01 11:33:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4de5e331ed181697c69610831775fdfe SHA-1: 48ef5fc6ca35f56d558c02dbaff2d28e2ba72aeb SHA-256: e937a18f0329c55cfd1325579f0d2a3a18b5f12cc18c1a8eed8609892f1b36ed
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/123?utm_term=touch+of+class+coupons+september+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369307/normal_602442f524f3f.pdfIn PDF document text
    • https://lepitedow.weebly.com/uploads/1/3/4/8/134885181/2746064.pdfIn PDF document text
    • https://vonefemupeme.weebly.com/uploads/1/3/5/9/135957005/ccf569.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/buvafobitoxavusiwomuw.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/96289752606.pdfIn PDF document text
    • https://tapidokebijimub.weebly.com/uploads/1/3/4/5/134577153/ed276652634e20.pdfIn PDF document text
    • https://rarejiwu.weebly.com/uploads/1/3/1/6/131606055/9027124.pdfIn PDF document text
    • https://gikesusemu.weebly.com/uploads/1/3/4/7/134775173/bimasupufo_bokiputisar_waseberaz_gotaraji.pdfIn PDF document text
    • https://xaxexuwolak.weebly.com/uploads/1/3/5/9/135978614/a2ec93c06.pdfIn PDF document text
    • http://zakewabo.scienceontheweb.net/tromm_washer_error_codes.pdfIn PDF document text
    • https://tupeduwexawagov.weebly.com/uploads/1/3/1/6/131607208/1313380.pdfIn PDF document text
    • https://wajirabipuxu.weebly.com/uploads/1/3/0/8/130874591/196ff446a3df6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490524/normal_5ff9e8f9f1c87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497687/normal_5ff203603b9e0.pdfIn PDF document text
    • https://tuxaxigete.weebly.com/uploads/1/3/5/3/135324810/5678780.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/55072268327.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/74412429406.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vawirir.atwebpages.com/policy_paradox_the_art_of_political_decision_making_3rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/how_to_know_serial_number_of_dell_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/facebook_app_crashing_android.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_off0000e6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 5620 bytes
SHA-256: 11fb0279c65e428789f785e824c856cad1a17f97fdd43e26a44e7a3c6afe5b7e
font_01_sfnt_off0000f9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 10960 bytes
SHA-256: 9d3dcd857ec428c46c53dada622e779a90cc6adeadd9f46a546e9c53f6100e4d