Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7214b5da144e238…

MALICIOUS

PDF

73.8 KB Created: 2021-03-19 19:13:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 71874df396e419e72dd4de6a40650ca4 SHA-1: 57a23365d7d15a1427cc9112beb50d7783c2c276 SHA-256: b7214b5da144e2380e39376152ae7ccc4d9e7e37f3cf693f47f9f725430ee631
206 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. It uses a callback-phone (TOAD) lure. 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 0.9998

Heuristics 7

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://baarspo.ru/aws?utm_term=hodgdon+powder+reloading+tables PDF link annotation
    • https://mawajajapok.weebly.com/uploads/1/3/4/3/134353668/romuvubegeja_majokimixeto_vivisetexenolu.pdfIn PDF document text
    • https://bopupuvi.weebly.com/uploads/1/3/1/6/131636777/bevavugumonokojolo.pdfIn PDF document text
    • https://rezikixudagip.weebly.com/uploads/1/3/4/7/134746502/zufigisij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_662a85124e1f45b39566cac2f4cd49c7.pdf?index=trueIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_3e9dc66c29644d359e9b4ab4f11cd026.pdf?index=trueIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_145015d7991d41eabce1fdd3d7b9124d.pdf?index=trueIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_46f5b5916e7e4c1d8725dcf912ec18f7.pdf?index=trueIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_8593e8fd2a7d4c45bbb2fa01e290fc70.pdf?index=trueIn PDF document text
    • http://lunigapevero.epizy.com/what_are_two_major_differences_between_a_viral_infection_and_a_bacterial_infection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/329db3da-f01c-4353-9457-195ca8a42b41/besubi.pdfIn PDF document text
    • http://zupotid.epizy.com/libreoffice_impress_custom_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/17255961345.pdfIn PDF document text
    • http://tumofif.rf.gd/sleigh_ride_by_leroy_anderson_sheet_music.pdfIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_412e24bb6e2a4038bec1d181317b5530.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zonivezada/99705098756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c218e75e-7b64-4c41-b267-3cdb39f78545/98786274336.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/basic_c_programming_books_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efe53136-c389-44e5-acdb-64dad12186c1/mavosidodakuxek.pdfIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_70a05a48037f4070a14a6b599aad618c.pdf?index=trueIn 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_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 5320 bytes
SHA-256: 0caac5189635ea5dde2a3ab6321dd05730cddb8df1b34d386ad8db2533707e21
font_01_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 11664 bytes
SHA-256: f88f83fa9b43425648fb7086fea69d2105d1983c8ffbc43ac246146b35919598