Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fde7042d232454…

MALICIOUS

PDF

72.5 KB Created: 2021-03-26 10:12:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3045c8cd0f495ff3eb27c06f37883051 SHA-1: 720b8a62d71421864d604e6552c97841870776eb SHA-256: 23fde7042d232454b1a2c64533befa1009e0be914c65e51f26112940bedc225f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://xezojetit.ru/123?utm_term=western+civilization+1+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501360/normal_6038d2ced0f70.pdfIn PDF document text
    • http://kopawaruda.22web.org/difawilotanorugatiwejuka.pdfIn PDF document text
    • https://nunugaborunis.weebly.com/uploads/1/3/1/4/131437119/tepoxixuxapux-kojeninizonifo.pdfIn PDF document text
    • http://zivarejewetuga.22web.org/sewemajimenuwu.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/nicS3ha/zimubetitirolebuvamirufar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5fd85e658e3bb.pdfIn PDF document text
    • https://tebizojejifijof.weebly.com/uploads/1/3/4/5/134589629/3465986.pdfIn PDF document text
    • http://fatogotem.22web.org/data_mining_notes.pdfIn PDF document text
    • https://laverikiwife.weebly.com/uploads/1/3/4/5/134502667/pekap.pdfIn PDF document text
    • https://cdn.sqhk.co/kemuxilajig/rPiidKI/temok.pdfIn PDF document text
    • https://tipureroxagojox.weebly.com/uploads/1/3/6/0/136096040/2828667.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d93d7d76-f60e-4a5a-b7cf-dcc717a7d85a/how_does_finding_your_roots_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c698617-12d5-4c8f-845c-e901bddb1bda/why_did_my_cursor_disappeared_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d02c6355-753a-4dbf-847a-16501eb07e10/how_to_get_nvivo_for_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/68288692577.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/which_oral_b_pro_toothbrush_is_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aefaf70-5ac1-4989-bc8c-ea5ff5baa46c/60675875696.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_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 5384 bytes
SHA-256: 24ff3fc2af28e62ed7388546d12c209666d4e7ecc320a9d311251f1625a8b986
font_01_sfnt_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 11224 bytes
SHA-256: 526b8b8aff6342a895763a52879d8efa83651265822190dc99758ca0f74d6876