Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d94cf37b29db95…

MALICIOUS

PDF

77.6 KB Created: 2021-03-23 13:43:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8ba7054257c1484a8bd618ecec3e7e99 SHA-1: 9bec2cc5adf93d5a75ca7739bbb9a632339399b2 SHA-256: d7d94cf37b29db95b59db5b291d417cd469cc32a484ec202e73315768d6b065a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • 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.
  • 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/award?keyword=amauta+revista+pdf PDF link annotation
    • http://reggis.info/14840795255axjuu.pdfIn PDF document text
    • https://kexezesokofu.weebly.com/uploads/1/3/3/9/133986719/mudejenuzosuke.pdfIn PDF document text
    • https://ratesikumetu.weebly.com/uploads/1/3/1/1/131163578/sufasivamos_rixuxemeju_nopaz.pdfIn PDF document text
    • http://matras-24.ru/bawafodutujfj2l5.pdfIn PDF document text
    • http://checkmyscore.info/lockout_relay_86_protectionppfz9.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/xexinaf_dinarolobepes_kenixa_zovurekeduvo.pdfIn PDF document text
    • http://siankaanmexico.com/misijipudenozegutupati2bvci.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/chlorate_formal_charge.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/vukiwevupowuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0be6cce-5df1-456c-ac91-3083aab61664/16586284255.pdfIn PDF document text
    • http://nekopujopulo.rf.gd/funonamijuvevapob.pdfIn PDF document text
    • http://fategag.rf.gd/jarisanapibagofibora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5a3778e-39e3-46d6-8b69-5102c032956d/evan_moor_daily_reading_comprehension_grade_5_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24a67052-5875-4f5d-9aac-426a81f3b197/48877247161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85e6b0bf-92c7-44af-9814-a28e0e376bd5/what_is_the_average_family_income_in_minnesota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2fb1421-1e04-4c65-bb78-5b31164a0322/master_forge_l3218_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/face_sheet_meaning_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a46ef667-6dc0-4e7a-ab8f-10dc279816e6/what_size_tires_are_on_a_2006_hyundai_sonata.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_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 5204 bytes
SHA-256: da69e332c47e5c74b6a5906d94d866bd313dabc7a54a0c6ff74e940462b1d3bb
font_01_sfnt_off00010216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 11540 bytes
SHA-256: 815f4c17c874c4f5b40d63b3fce3a890a73ea2602b2a7a64220ecd20200ef890

Open this report in the interactive analyzer, or submit your own file for analysis.