Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14038eeb569e1b8…

MALICIOUS

PDF

75.0 KB Created: 2021-03-24 05:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 87f3f2835142038b63b80e8992bcb20a SHA-1: c783f0a1404726633dfeb953b37873c719013ee3 SHA-256: b14038eeb569e1b806d3e51e8903df894425670e512a2b61052655387c1b60a7
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 0.9998

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://xajibur.ru/123?utm_term=caesarean+section+nice+guideline PDF link annotation
    • https://cdn.sqhk.co/padezeda/BPhhLji/mibigukevewem.pdfIn PDF document text
    • http://dilofab.22web.org/amelogenesis_imperfecta_adalah.pdfIn PDF document text
    • https://cdn.sqhk.co/fabokofe/VjeZ74M/borewizedobizunevalig.pdfIn PDF document text
    • https://cdn.sqhk.co/fobusobapeji/hjajbjj/37500907237.pdfIn PDF document text
    • https://cdn.sqhk.co/gutevazito/iiX5igZ/live_stories_instagram_online.pdfIn PDF document text
    • http://jitutirujemi.22web.org/kuguzawezo.pdfIn PDF document text
    • https://cdn.sqhk.co/pogadidotilu/Gifihh4/koala_squishmallow_purple.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/Zhfxz7M/50456210938.pdfIn PDF document text
    • http://letabumo.getenjoyment.net/aqa_a_level_sociology_year_1_and_as_student_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bevapewi.epizy.com/66455696095.pdfIn PDF document text
    • http://vakakumiwizexoj.epizy.com/dorma_bed_sheets.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/42690110710.pdfIn PDF document text
    • http://puvuvijafu.rf.gd/jspdf_autotable_is_not_a_function.pdfIn PDF document text
    • http://tulajadulixo.myartsonline.com/how_to_write_book_for_amazon.pdfIn PDF document text
    • https://264aa3b4-28a3-4a3b-9cf4-afdf28ba9476.filesusr.com/ugd/28a074_5dd1c003537245ffb6b6b6c179ea30f8.pdf?index=trueIn PDF document text
    • http://gaguvidub.epizy.com/15098075584.pdfIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_42cdfb272c74492d948c4bbd823e7f62.pdf?index=trueIn PDF document text
    • http://vagaxalelevirot.epizy.com/71538358454.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_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 5012 bytes
SHA-256: 0148f27c9686c9bbd1b8c4ee474f2514959abff31004f534ee2e1dcd13bb1fd1
font_01_sfnt_off0000faad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 10636 bytes
SHA-256: 870aae7b9b6737f636a7236171a1fb5e5ab5949fd1e68e91d24e9632512aee41

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